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1
Published 1988
Springer Netherlands
Table of Contents: “...16. ‘Die Abstände der Atome im Molekül und im Kristall’ (with M. Born), Naturwiss. 6, 496...”
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2
Published 1974
Springer Netherlands
Table of Contents: “... Space-Times -- 3. The B.M.S. Group -- 4. Twistor Theory -- SL(2,C) Symmetry of the Gravitational Field...”