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“Two Kinds of Trouble.” How Old Is the Universe?, by DAVID A. WEINTRAUB, Princeton University Press, PRINCETON; OXFORD, 2011, pp. 319–332, Accessed 14 Aug. 2020.
WEINTRAUB, D. (2011). Two Kinds of Trouble. In How Old Is the Universe? (pp. 319-332). PRINCETON; OXFORD: Princeton University Press. Retrieved August 14, 2020, from
WEINTRAUB, DAVID A. "Two Kinds of Trouble." In How Old Is the Universe?, 319-32. PRINCETON; OXFORD: Princeton University Press, 2011. Accessed August 14, 2020.

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