Selected Publications
- Friedman, A. (1922). "Über die Krümmung des Raumes". Zeitschrift für Physik 10 (1): 377–386. Bibcode 1922ZPhy...10..377F. doi:10.1007/BF01332580.. English translation in: Friedman, A. (1999). "On the curvature of space". General Relativity and Gravitation 31 (12): 1991–2000. Bibcode 1999GReGr..31.1991F. doi:10.1023/A:1026751225741. edit The original Russian manuscript of this paper is preserved in the Ehrenfest archive, together with some letters and unpublished work.
- Friedman, A. (1924). "Über die Möglichkeit einer Welt mit konstanter negativer Krümmung des Raumes". Zeitschrift für Physik 21 (1): 326–332. Bibcode 1924ZPhy...21..326F. doi:10.1007/BF01328280.. English translation in: Friedmann, A. (1999). "On the Possibility of a World with Constant Negative Curvature of Space". General Relativity and Gravitation 31 (12): 2001–2008. Bibcode 1999GReGr..31.2001F. doi:10.1023/A:1026755309811. edit
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