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Friedmann, A. (1922) Uber die Krummung des Raumes. Zeitschrift fur Physik, 10, 377-386. English Trans. (1999) On the Curvature of Space. General Relativity and Gravitation, 31, 1991-2000.
http://www.ymambrini.com/My_World/History_files/Friedman_1922.pdf
https://doi.org/10.1023/A:1026751225741

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