by (United States)F.J.Tipler;by (United Kingdom)S.W.Hawking; by (United States)J.F.Rabek;by (United Kingdom)J.V.Dawkins; by (United States)P.E.Tippens;by (United Kingdom)R.L.Murray; by (United States)C.A.Murray;by (United Kingdom)S.H.Hudson; by (United States)G.Jones;by (United Kingdom)S.G.Davies; by (United States)J.D.Lester;by (United Kingdom)S.Kanelli; by (United States)F.E.Clese;by (United Kingdom)P.D.B.Collins; by (United States)F.B.Hildebrand;by (United Kingdom)L.W.Johnson; by (United States)F.L.Pilar;by (United Kingdom)W.G.Richards; by (United States)G.B.Whitham;by (United Kingdom)A.W.Hendry;