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Dr. A. J. Willmott — Department of Computer Science York University Heslington York YO1 5DD United Kingdom.

Mr. Winkler — Department of Chemical and Process Engineering University of Surrey Guildford Surrey GU2 5XH United Kingdom.

Dr. Richard Winterton — School of Manufacturing and Mechanical Engineering The University of Birmingham Edgbaston Birmingham B15 2TT United Kingdom.

Mr. David Woolnough — ETSU Building 156 Harwell Laboratory Oxfordshire 0X11 ORA United Kingdom.

Mr. V. S. Yungman — IVTAN, Moscow 127412 Russia.

Mr. I. G. Zaltsman — IVTAN, Moscow 127412 Russia.

Mr. Yu. A. Zeigarnik — IVTAN, Moscow 127412 Russia.

Professor M. F. Zhukov — ITF, Novosibirsk -90 Russia.

Dr. Yuzhen Zhao — Department of Power Engineering Box 513 Harbin Institute of Technology Harbin 150006 P. R. China.

Professor Y. Zvirin — Technion---Israel Institute of Technology Faculty of Mechanical Engineering Haifa 32000 Israel.