• M.A. Alam, M.S. Lundstrom:
  "A Transition Matrix Study of Laser Dynamics";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 298 - 301.
  
  
• M.G. Ancona, C.R. De Vore:
  "Numerical Simulation of High-Field Transport Using a Flux-Corrected Transport Algorithm";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 256 - 259.
  
  
• Y. Apanovich, R. Cottle, E. Lyumkus, B. Polsky, A. Shur, A. Tcherniaev, P. Blakey:
  "Breakdown Simulation of Semiconductor Devices Including Energy Balance and Lattice Heating";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 107 - 110.
  
  
• V. Aristov, N. Bannov, V. Mitin, M.A. Stroscio:
  "Acoustic Phonon Spectrum and Density of States in Free Standing Quantum Wells";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 199 - 202.
  
  
• R. Baca, M. Grupen, K. Hess:
  "A Self-Consistent Simulation of the Modulation Response of Quantum-Well Lasers Including the Effect of Strain";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 318.
  
  
• B. Bagheri, A. Ilin, R. Scott, D. Xie:
  "Parallel Solution of Elliptic Boundary Value Problems";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 260 - 265.
  
  
• N. Bannov, V. Aristov, V. Mitin:
  "Confined Acoustic Phonon Controlled Relaxation Times in Free Standing Quantum Wells";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 191 - 194.
  
  
• F.A. Buot, A.K. Rajagopal:
  "Quantum Transport Using Liovillean Quantum-Field Dynamics and Functional Approach to Self-Consistent Many-Body and Scattering Effects";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 183 - 186.
  
  
• J. Cai, H.-L. Cui, N.J. Horing, X.L. Lei, E. Lenzing, B.S. Perlman:
  "Device Modeling Using Hydrodynamic Balance Equations";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 127 - 130.
  
  
• Y. Cai, R. Engelmann:
  "Numerical Modeling of Injection Induced Carrier Confinement in Quantum-Well (QW) Structures";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 314 - 317.
  
  
• R. Caska, R. Mickevicius, V. Mitin, M.A. Stroscio:
  "Monte Carlo Simulation of Non-Equilibrium Electron-Phonon System in Quantum Wires";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 25 - 28.
  
  
• M. Chen, W. Porod:
  "Numerical Simulation of the Effect of Surface Charges on Electron Confinement in Quantum Dot Structures";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 215 - 218.
  
  
• W.M. Coughran Jr., E. Grosse:
  "Domain Decomposition Applied to the Drift-Diffusion Equations";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 247.
  
  
• S. Datta, G. Klimeck, R. Lake, Y. Lee, M.J. McLennan:
  "Quantum Device Simulation Including Interactions";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 157 - 162.
  
  
• R. Drury, C.M. Snowden:
  "Fast and Accurate HFET Modeling for Microwave CAD Applications";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 78 - 81.
  
  
• A. Duncan, C.H. Lee, U. Ravaioli:
  "Monte Carlo Studies of Hot Electron Generation in Scaled MOSFETs";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 37 - 40.
  
  
• S.M. Durbin, D.H. Levi, J.L. Gray:
  "A Numerical Model for Computing the Emission Spectrum in Time-Resolved Photoluminescence Experiments";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 323 - 326.
  
  
• T. Ezaki, N. Mori, K. Taniguchi, C. Hamaguchi, U. Ravaioli:
  "Electron Mobility in Quantum Wires Limited by Optical-Phonon Scattering";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 163 - 166.
  
  
• E. Fatemi:
  "Hydrodynamic Model and Jump Conditions for Discontinuous Mass and Electric Potential in Heterostructure Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 135 - 138.
  
  
• C.L. Fernando, W.R. Frensley:
  "Intrinsic High Frequency Characteristics of Tunneling Heterostructure Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 235 - 238.
  
  
• W. Fichtner:
  "Advances in Multi-Dimensional TCAD";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 69.
  
  
• J. Fogarty, W. Kong, R. Solanki:
  "Monte Carlo Simulation of High Field Electron Transport in ZnS with Modified Density of States";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 306 - 309.
  
  
• A. Galick, M. Macucci, U. Ravaioli, T. Kerkhoven:
  "Self-Consistent, Quasi-3D Simulation of Quantum Waveguide Couplers";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 149 - 152.
  
  
• M. Gault, H. Matsuura, K. Furuva, P. Mawby, M.S. Towers:
  "The Inclusion of a Finite Capture Time in the Numerical Simulation of Quantum Effect Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 207 - 210.
  
  
• T.J. Godin, R. Haydock:
  "An Accurate, Efficient Algorithm for Calculation of Quantum Transport in Extended Structures";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 243 - 246.
  
  
• M. Grupen, K. Hess:
  "Coupling Classical Carrier Transport, Capture, and Size Quantization in a Quantum Well Laser Simulator";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 302 - 305.
  
  
• H.L. Gubin, T.R. Govindan:
  "Resonant Tunneling Calculations via the Density Matrix in the Coordinate Representation";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 179 - 182.
  
  
• K.K. Gullapalli, D.P. Neikirk:
  "Incorporating Spatially Varying Effective-Mass in the Wigner-Poisson Modell for AlAs/GaAs Resonant-Tunneling Diodes";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 171 - 174.
  
  
• X. Han, D.M. Barry, H.J. Howes:
  "A Parallel Multigrid Solver for Semiconductor Device Equations";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 270 - 273.
  
  
• H.K. Harbury, W. Porod, R.K. Smith:
  "Open Boundary Conditions for Multidimensional Electronic Scattering States";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 153 - 156.
  
  
• J.M. Higman:
  "A Comparison of BTE-Based Electron Simulations for Silicon";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 1 - 6.
  
  
• L. Hlou, J.C. Vaissiere, J.P. Nougier, L. Varani, P. Houlet, L. Reggiani, M. Fadel, P. Kocevar:
  "Time-Dependent Analysis of the Coupled Hot-Carrier-Hot-Phonon Boltzmann Equations";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 49 - 52.
  
  
• C. Huster, M.S. Lundstrom:
  "Full Band S-Matrix Simulation of Electron Transport in Si";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 11 - 14.
  
  
• M.-K. Ieong, T.-W. Tang:
  "A General Hydrodynamic Solver for Deep Submicron Silicon Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 111 - 114.
  
  
• S. Jallepalli, C.-F. Yeap, S. Krishnamurthy, X.L. Wang, C.M. Maziar, A. Tasch:
  "Application of Hierarchical Transport Models for the Study of Deep Submicron Silicon n-MOSFETs";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 91 - 94.
  
  
• J.W. Jerome, C.-W. Shu:
  "Transport Effect, Hyperbolicity, and Shock Capturing Algorithms for Device Simulations";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 252 - 255.
  
  
• C. Jungemann, P. Graf, R. Thoma, W.L. Engl:
  "New Highly Efficient Method for the Analysis of Correlation Functions Based on a Spherical Harmonics Expansion of the Boltzmann Transport Equation's Green's Function";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 45 - 48.
  
  
• E.C. Kan, R.W. Dutton:
  "An Alternative Method for Compact Model Construction and Parameter Extraction";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 99 - 102.
  
  
• J.A. Kenrow, T.K. Gustafson:
  "Dynamical Transport Model of a Coupled Electron-Phonon System in a Quantum Wire";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 203 - 206.
  
  
• R. Khoie:
  "Formulation of a Full Dynamic Transport Model for Heterostructure Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 119 - 122.
  
  
• G.A. Kosinovsky, M. Grupen, K. Hess:
  "Electron-Hole Imbalance in the Active Region of QW Lasers, and its Effect on the Threshold Current";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 319 - 322.
  
  
• J.P. Kreskovsky, H.L. Grubin:
  "Transport in Two-Dimensional Quantum Well HEMTs";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 103 - 106.
  
  
• A. Kriman, R. Joshi:
  "Scaled Ensemble Monte Carlo Studies of Impact Ionization";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 57 - 60.
  
  
• C.M. Krowne:
  "Quantum Transport and Coherence in Boundary Limited Electronic Devices: Recursive Dyson Hamiltonian Green's Function and Finite Element Techniques in Heterostructures";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 187 - 190.
  
  
• R. Lake:
  "Quantum Device Modeling with Non-Equilibrium Green Functions";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 239 - 242.
  
  
• W.S. Lawson:
  "A Rejection Method for Selection of Scattered States";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 41 - 44.
  
  
• M. Leng, C.S. Lent:
  "Magnetic-Quasi-Bound-State Induced Resonant Coupling of Edge States";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 223 - 226.
  
  
• C.S. Lent, M. Leng, P.D. Tougaw:
  "Quantum Device Simulation: Open Boundary Conditions for the Schrödinger Equation";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 139 - 144.
  
  
• R. Madabhushi, Q. Lin, G.-C. Tai, N. Goldsman, I.D. Mayergoyz:
  "Three-Dimensional Hydrodynamic Simulation of Submicron MOSFETs";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 70 - 73.
  
  
• R. Mickevicius, V. Mitin:
  "Monte Carlo Simulation of Electron Streaming Caused by Inelastic Acoustic-Phonon Scattering in Quantum Wires";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 195 - 198.
  
  
• V. Mitin, V. Gruzinskis, E. Starikov, P. Shiktorov, L. Reggiani, L. Varani:
  "Impedance Field in Submicron n⁺nn⁺ InP Diodes";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 95 - 98.
  
  
• C.G. Morton, J. Wood, W. Batty, C.M. Snowden:
  "Effect of Heavy Doping on Conduction Band Density of States: Implications for Device Modelling";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 131 - 134.
  
  
• N. Nintunze, M.A. Osman:
  "Monte Carlo Modeling of the Dynamic Screening Effects on Ultrafast Relaxation of Photo-Excited Carriers in GaAs";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 284 - 287.
  
  
• J.P. Nougier, L. Hlou, P. Houlet, J.C. Vaissiere, L. Varani:
  "An Alternative Solution of the Boltzmann Equation: The "Scattered Packet Method"";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 15 - 18.
  
  
• A.L. Pardhanani, G.F. Carey:
  "Adaptive Grid and Iterative Techniques for Submicron Device Simulation";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 248 - 251.
  
  
• S.S. Pennathur, K. Bhattacharyya, J.F. Wager, S.M. Goodnick:
  "Fullband Ensemble Monte Carlo Modeling of High Field Transport in the ZnS Phosphor of AC Thin Film Electroluminescent Devices";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 288 - 291.
  
  
• P.W. Rambo, J. Denavit:
  "Time-Step Stability for Self-Consistent Monte Carlo Device Simulation";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 33 - 36.
  
  
• P.W. Rambo, W.S. Lawson, C.D. Capps, R.A. Falk:
  "Time-Dependent Simulations of Filament Propagation in Photoconducting Switches";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 327 - 330.
  
  
• A. Rein, G. Zandler, M. Saraniti, P. Lugli, P. Vogl:
  "Celluar Automation Simulations of Planar Doped Barrier Field Effect Transistor in Silicon";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 7 - 10.
  
  
• C. Ringhofer:
  "Galerkin Methods for the Boltzmann Equation Using Variable Coordinate Systems";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 87 - 90.
  
  
• F. Rossi, S. Haas, T. Kuhn:
  "A Generalized Monte Carlo Approach for the Simulation of the Coherent Ultrafast Dynamics in Photoexcited Semiconductors";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 278 - 283.
  
  
• L. Rota, S.M. Goodnick:
  "Monte Carlo Study of Ionized Impurity Scattering in Quantum Wires";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 231 - 234.
  
  
• J.W. Scott, B.J. Thibeault, S.W. Corzine, L.A. Coldren:
  "Advances and Opportunities in the Design and Modeling of Vertical-Cavity Surface-Emitting Lasers";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 292 - 297.
  
  
• S. Searles, D.L. Pulfrey:
  "Tunneling and its Inclusion in Analytical Models for Abrupt HBTs";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 123 - 126.
  
  
• Z. Shao, W. Porod, C.S. Lent:
  "A Linear Eigenvalue Method for Calculating the Positions of Transmission Poles and Zeros in Resonator Structures";
  Talk: Conference, Portland, USA; 05-18-1994; in: "Proc. of IWCE", (1994), 219 - 222.
  
  
• J.P. Stanley, N. Goldsman:
  "An Efficient Full-Zone k·p Method for 'on the fly' Calculation of Valence Band Energies in Hole Transport Studies";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 274 - 277.
  
  
• S. Subramanian:
  "A Self-Consistent Solution of One-Dimensional Schrödinger-Poisson Equations by Newton-Raphson Iteration Technique";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 211 - 214.
  
  
• T.-W. Tang, J. Nam:
  "Inclusion of Viscous Effects in the Hydrodynamic Modeling of Ultrasmall Silicon Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 115 - 118.
  
  
• K. Taniguchi, M. Yamaji, T. Kunikiyo, Y. Kamakura, H. Takenaka, M. Morifugi, K. Sonoda, C. Hamaguchi:
  "Monte Carlo Simulation of Impact Ionization Processes in Silicon";
  Talk: Conference, Portland, USA (invited); 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 19 - 24.
  
  
• D.Z. Ting, S.K. Kirby, T.C. McGill:
  "Applications of 3D Quantum Transport Simulations";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 145 - 148.
  
  
• P.D. Tougaw, C.S. Lent:
  "Dynamic Behavior of Coupled Quantum-Dot Cells";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 227 - 230.
  
  
• C.S. Tsang-Ping, D.M. Barry, C.M. Snowden:
  "Parallel Implementation of GaAs MESFET Electrothermal Simulation on a Transputer Based System";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 266 - 269.
  
  
• J.C. Vaissiere, J.P. Nougier, L. Varani, P. Houlet, L. Reggiani, E. Starikov, P. Shiktorov:
  "Numerical Solution of the Perturbed Boltzmann Equation in Frequency and Time Domains";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 53 - 56.
  
  
• L. Varani, L. Reggiani, T. Kuhn, T. Gonzalez, D. Pardo:
  "Microscopic Simulation of Electronic Noise in Semiconductor Unipolar Structures";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 29 - 32.
  
  
• D. Vasileska, P. Bordone, D.K. Ferry:
  "Evaluation of the Electron Density of States in a Si-SiO₂ Interface Using the Zero-Temperature Green's Function Formalism";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 175 - 178.
  
  
• Y.-J. Wu, N. Goldsman:
  "Using the Random-K Approximation to Consistently Incorporate Impact Ionization into the Generalized Expansion Method for Solving the Multi-Band BTE in Silicon";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 61 - 64.
  
  
• Z. Yu, L. So, E.C. Kan, R.W. Dutton:
  "Dual Energy Transport Model for Advanced Device Simulation";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 82 - 86.
  
  
• Q.S. Zhang, J.A. van Vechten, T.K. Monson:
  "Investigation of the Diffusion into Si of Au via Frank-Turnbull Mechanism by Monte Carlo Simulation";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 65 - 68.
  
  
• C. Zhao, R. Engelmann:
  "Simulation of Periodically Segmented Waveguides as Concurrent Bragg Reflectors and Quasi-Phase-Matched Second Harmonic Generators";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 310 - 313.
  
  
• J. Zhou, D.K. Ferry:
  "Three-Dimensional Simulation of the Effect of Random Impurity Distributions on Conductance for Deep Submicron Devices";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 74 - 77.
  
  
• M. Ziger, W. Pötz:
  "Loss of Phase Coherence in Semiconductor Heterostructures Due to the Coulomb Interaction";
  Talk: Conference, Portland, USA; 05-18-1994 - 05-20-1994; in: "Proc. of IWCE", (1994), 167 - 170.