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)G.M.De La Penha;by (United States)M.E.Gurtin; by (Federal Republic of Germany)J.Bourgain;by (United States)P.L.Duren; 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)H.A.Bartels;by (United States)D.C.Harris; by (Federal Republic of Germany)M.Aigner;by (United States)B.Bollobas; by (Federal Republic of Germany)O.Vejvoda;by (United States)E.Zauderer; by (Federal Republic of Germany)T.Matsubara;by (United States)D.R.Bates;