by (United Kingdom)B.Bartok;by (Federal Republic of Germany)V.L.Beethoven; by (United Kingdom)J.Hamilton;by (Federal Republic of Germany)G.Eilenberger; by (United Kingdom)D.C.Bassett;by (Federal Republic of Germany)H.Bottger; by (United Kingdom)C.Lanczos;by (Federal Republic of Germany)S.Machado; by (United Kingdom)J.F.Lee;by (Federal Republic of Germany)J.Messer; by (United Kingdom)M.H.Degroot;by (Federal Republic of Germany)B.R.Frieden; by (United Kingdom)P.Stanley;by (Federal Republic of Germany)P.S.Theocaris; by (United Kingdom)D.G.Northcott;by (Federal Republic of Germany)A.J.Chintschin; by (United Kingdom)C.M.Will;by (Federal Republic of Germany)H.Weyl; by (United Kingdom)J.M.Ziman;by (Federal Republic of Germany)P.Bruesch;