by (United Kingdom)N.E.Parker;by (United States)G.B.Ryvicki; by (United Kingdom)R.E.Parker;by (United States)D.F.Falk; by (United Kingdom)W.E.Parry;by (United States)A.O.Barut; by (United Kingdom)N.A.Parris;by (United States)L.P.Jackson; by (United Kingdom)A.Lande;by (United States)G.Ludwig; by (United Kingdom)T.D.Lee;by (United States)G.D.Mahan; by (United Kingdom)C.E.Eckersly;by (United States)E.Ehrlich; by (United Kingdom)N.Harvey;by (United States)R.E.Phillips; by (United Kingdom)N.S.Allen;by (United States)R.B.Cundall; by (United Kingdom)D.Rowntree;by (United States)G-C.Rota;