by (Federal Republic of Germany)B.d' Espagnat;by (United States)K.Gottrfied; by (Federal Republic of Germany)H.Federer;by (United States)G.Kothe; by (Federal Republic of Germany)T.S.Huang;by (United States)L.Levi; by (Federal Republic of Germany)A.H.Volkel;by (United States)J.S.Trefil; by (Federal Republic of Germany)M.Aigner;by (United States)B.Bollobas; by (Federal Republic of Germany)T.Matsubara;by (United States)D.R.Bates; by (Federal Republic of Germany)K.L.Mcavaney;by (United States)R.S.Pierce; by (Federal Republic of Germany)B.Okdendal;by (United States)E.C.Zeeman; by (Federal Republic of Germany)C.Faith;by (United States)G.Fuller; by (Federal Republic of Germany)D.F.Barbe;by (United States)D.L.Cannon;