重力による時間の遅れ
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↑ Shapiro, I. I.; Reasenberg, R. D. (30 September 1977). “The Viking Relativity Experiment”. Journal of Geophysical Research (AGU) 82 (28): 4329-4334. Bibcode: 1977JGR....82.4329S. doi:10.1029/JS082i028p04329. https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/JS082i028p04329 2021年2月6日閲覧。.
↑ Thornton, Stephen T.; Rex, Andrew (2006). Modern Physics for Scientists and Engineers (3rd, illustrated ed.). Thomson, Brooks/Cole. p. 552. ISBN 978-0-534-41781-9. https://books.google.com/books?id=g74rAAAAYAAJ