by (Netherlands)R.Kubo;by (USSR)L.D.Landau; by (Netherlands)P.J.Chen;by (USSR)A.S.Davydov; by (Netherlands)V.Ponec;by (USSR)L.Dobrzynski; by (Netherlands)M.Jacob;by (USSR)A.S.Kompaneyets; by (Netherlands)B.L.Waerden;by (USSR)A.Yariv; by (Netherlands)C.V.Westenholz;by (USSR)A.Ramakrishnan; by (Netherlands)F.Munniksma;by (United States)J.A.Jarnow; by (Netherlands)H.Zalucki; (United States)B.T.Lewis; by (Netherlands)J.Gentilli;by (India)E.T.Atkinson;