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“The Trouble with Gravity.” How Old Is the Universe?, by DAVID A. WEINTRAUB, Princeton University Press, PRINCETON; OXFORD, 2011, pp. 209–216, Accessed 15 Aug. 2020.
WEINTRAUB, D. (2011). The Trouble with Gravity. In How Old Is the Universe? (pp. 209-216). PRINCETON; OXFORD: Princeton University Press. Retrieved August 15, 2020, from
WEINTRAUB, DAVID A. "The Trouble with Gravity." In How Old Is the Universe?, 209-16. PRINCETON; OXFORD: Princeton University Press, 2011. Accessed August 15, 2020.

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