Physiker (1898–1978). Eigenh. Brief mit U. („G. Wentzel“). Lafayette (Indiana). 1 S. Gr.-4to.
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Gregor Wentzel (1898–1978), Physiker. E. Brief mit U. („G. Wentzel“). Lafayette (Indiana), 11. März 1947. 1 S. Gr.-4°. – An den Physiker und Nobelpreisträger Isidor Isaac Rabi (1898–1988): „[...] As to eventual lectures, I thank you very much for the invitation. Perhaps one of the following subjects might interest you: I) a summarizing report on theories of point electrons, 2) a survey of the present status of Heisenberg’s S-matrix theory? (I have not done much work on the S-matrix myself, but I happen to know 2 unpublished papers by Heisenberg which seem to be unknown in this country.) [...]“.