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Dr. P. A. A. Boeser (5)
Dr. Richard Grün (auth.) (5)
Dr. Robert Lenk (auth.) (5)
Dr. W. Kopp (auth.) (5)
Dr.-Ing. Ewald Sachsenberg (auth.) (5)
Dr.-Ing. Otto Blum (auth.) (5)
E. W. Hobson (5)
Eddington A.S. (5)
Friedrich Goldschmidt (auth.) (5)
G. Lister Sutcliffe (5)