Sympos. Papers, RTCM Assembly Meeting, San Diego, 26 - 28 April, 1976
Propulsion electrique applications spatiales, Journees d'Etudes, Toulouse, 21-23 juin, 1972
XXII Convegno Internazionale delle Comunicazion, Genova, 7-12 Ottobre, 1974
Lectures Delivered at the Royaumont Seminar, Royaumont, 25 26 June 1974
Communication with Extraterrestrial Intelligence, Yerevan, 5- 11 Sept., 1971
third international electric vehicle symposium and exposition, washington, february 19-21, 74
8th International Aerospace Instrumentation Symposium 24th-27th March 1975 Cranfield England
Proc. of The Reliability Engng. Conf. For The Electr. Power Ind., New York, 21 February 1974
What impacts ATC? 18th Annual Meeting and Technical Program Miami Beach, October 15 - 18, 1973