Einstein, Albert
born 14. March 1879 in Ulm; died 18. April 1955 in Princeton, NJBrief von Albert Einstein an Hans Vaihinger, 03.05.1919 [03.05.1919]
Berlin, 03.05.1919 [03.05.1919]Brief von Albert Einstein an Hans Vaihinger, 30.06.1921 [30.06.1921]
Berlin, 30.06.1921 [30.06.1921]Brief von Max Planck an Adolf Erman
Planck, 07.06.1934Kelsen, Hans
born 11. October 1881 in Prag; died 19. April 1973 in Berkeley, Calif.Brief von Hans Kelsen an Hans Vaihinger, 19.05.1917 [19.05.1917]
Wien, 19.05.1917 [19.05.1917]