by (Federal Republic of Germany)L.D.Landau;by (Federal Republic of Germany)E.M.Lifshitz;by (Federal by (Federal Republic of Germany)L.D.Landau;by (Federal Republic of Germany)E.M.Lifshitz;by (United S by (Federal Republic of Germany)L.D.Landau;by (Federal Republic of Germany)E.M.Lifshitz;Tran. by (Un by (Federal Republic of Germany)D.C.Fries;by (Federal Republic of Germany)D.Zeitnitz;by (United Stat by (Federal Republic of Germany)D.I.Davies;by (Federal Republic of Germany)M.J.Parrott;by (United St by (Federal Republic of Germany)T.S.Kuo;by (Federal Republic of Germany)S.M.Wong;by (Federal Republi by (Federal Republic of Germany)R.S.Freese;by (Federal Republic of Germany)O.C.Garcia;by (United Sta by (Federal Republic of Germany)Z.Nitecki;by (Federal Republic of Germany)C.Robinson;by (United Stat by (Federal Republic of Germany)H.BuBmann;by (Federal Republic of Germany)L.W.Schischkowa; by (Federal Republic of Germany)H.Stalb;by (Federal Republic of Germany)R.Schmeider;