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2. Empty Space-Times Admitting a Three Parameter Group of Motions
3. and , Solvay Conference Report, Edition Stoops, Brussels 1958, pp. 149–159;
4. Gravitation: An introduction to current research, ed Wiley, New York 1962, pp. 438–469.
5. and , Structure and Evolution of the Universe (in Russian), Nauka, Moskow 1975.