by (United States)M.Holt;by (Federal Republic of Germany)L.D.Landau; by (United States)S.C.Hunter;by (Federal Republic of Germany)L.D.Landau; by (Federal Republic of Germany)L.V.Beethoven;by (Spain)M.De Falla; by (Federal Republic of Germany)L.Hormander;by (USSR)H.M.Srivastava; by (Federal Republic of Germany)L.V.Beethoven; (United States)S.Barber; by (Federal Republic of Germany)L.Beltzmann;by (United Kingdom)M.G.Bowler; by (United States)W.D.Knight...et al;by (Federal Republic of Germany)L.D.Landau;