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———. 1931a. “A Homogeneous Universe of Constant Mass and Increasing Radius Accounting for the Radial Velocity of Extra-Galactic Nebulae.” Monthly Notices of the Royal Astronomical Society, 19, 483.
———. 1931b. “The Expanding Universe.” Monthly Notices of the Royal Astronomical Society, 91, 490.
———. 1934. “Evolution of the Expanding Universe.” Proceedings of the National Academy of Sciences, 20, 12.
———. 1949. “The Cosmological Constant.” In Albert Einstein: Philosopher Scientist. Edited by P. A. Schilpp (Evanston, IL: Library of Living Philosophers).