by (Federal Republic of Germany)V.I.Istratescu;by (United States)E.L.Lehmann; by (Federal Republic of Germany)B.Okdendal;by (United States)E.C.Zeeman; by (Federal Republic of Germany)D.F.Barbe;by (United States)D.L.Cannon; by (Federal Republic of Germany)E.Grieg;by (United States)C.L.Hanon; by (Federal Republic of Germany)P.Bruesch;by (United States)N.P.Suh; by (Federal Republic of Germany)T.S.Huang;by (United States)L.Levi; by (Federal Republic of Germany)W.Demtroder;by (United States)M.D.Levenson; by (Federal Republic of Germany)C.K.Rhodes;by (United States)H.C.Casey; by (Federal Republic of Germany)D.Butkovic;by (United States)B.W.Gelbaum; by (Federal Republic of Germany)D.V.Dalen;by (United States)W.V.QUINE;