Antenna Testing Techniques, Workshop, ESTEC, Noordwijk, 6-8 June, 1977
Oberflaechennaher Tunnelbau : Entwicklungen und Tendenzen; Stadtbahnbau in Bochum
1988 Rapid Transit Conference, [Buffalo, New York, June 4 - 9, 1988]
Internationales Symposium Forschung und Neue Technologien im Verkehr
Internationales Symposium Forschung und Neue Technologien im Verkehr
1989 Rapid Transit Conference, [June 4 - 8, 1989, Pittsburgh, PA]
APTA 1992 Rapid Transit Conference, [Los Angeles, California, June 14 - 17, 1992]
1993 Rapid Transit Conference, Miami, Florida, [June 6 - 9, 1993]
1994 Rapid Transit Conference : June 11 - 16th, Sacramento, California