by LOUIS M. DE HAES, EMIEL A. HOFMAN, HUGO K. GEVERS
Year of Publication 21.11.1972

by LOUIS M. DE HAES, JOHANNES J. VANHEERTUM, HUGO K. GEVERS
Year of Publication 16.05.1972

by LOUIS M. DE HAES, JOHANNES J. VANHEERTUM, HUGO K. GEVERS
Year of Publication 20.07.1971

by DE WINTER, WALTER F, DE HAES, LOUIS M, GEVERS, HUGO K, VERMULEN, LEON L
Year of Publication 30.01.1979

by KRAFFT, WERNER, BONGAERTS, STEPHAN J, VAN PEE, PAUL D, DE HAES, LOUIS M, GEVERS, HUGO K, VERMEULEN, LEON L
Year of Publication 04.04.1978