by (Netherlands)G.M.L.Gladwell;by (USSR)J.L.Nowinski...et al; by (Netherlands)M.Jacob;by (USSR)A.S.Kompaneyets; by (Netherlands)B.O.Seraphin; (France)M.Balkanski...et al; by (Netherlands)V.Ponec;by (USSR)L.Dobrzynski; by (Netherlands)B.L.Waerden;by (USSR)A.Yariv; by (Netherlands)P.J.Chen;by (USSR)A.S.Davydov; by (United Kingdom)S.M.Blinder;by (USSR)V.B.Berestetskii...et al; by (Netherlands)Eric Mendelsohn;by (United States)M.P.Dolciani...et al;