by FENZEL, HERMANN, STUDEN, CH, JANSER, HERBERT. (ETH), BOLLIGEN, CH
Year of Publication 31.05.1990

by ZWAHLEN, EUGEN, BERN, CH, GERTSCH, PETER, NIEDERSCHERLI, CH, JANSER, HERBERT. ETH, BOLLIGEN, CH, IMHOF, ROBERT, BERN, CH
Year of Publication 22.07.1993