by KANKURA,RALF,.DR, KECK,JUERGEN
Year of Publication 26.04.1979

by KECK, JUERGEN, 5170 JUELICH, DE, KANKURA, RALF. DR., 5100 AACHEN, DE
Year of Publication 15.12.1983

by KECK, JUERGEN, 5170 JUELICH, DE, KANKURA, RALF. DR., 5100 AACHEN, DE
Year of Publication 13.05.1982

by KANKURA,RALF,.DR, KECK,JUERGEN
Year of Publication 07.12.1978