重力による時間の遅れ
How Einstein Created Relativity out of Physics and Astronomy (illustrated ed.). Springer Science & Business Media. p. 118. ISBN 978-1-4614-4781-8. https://books.google.com/books?id=2U6qvi5TlE4C Extract of page 118
↑ John A. Auping, Proceedings of the International Conference on Two Cosmological Models, Plaza y Valdes, ISBN 9786074025309
↑ Johan F Prins, On Einstein's Non-Simultaneity, Length-Contraction and Time-Dilation
↑ Kogut, John B. (2012). Introduction to Relativity: For Physicists and Astronomers (illustrated ed.). Academic Press. p. 112. ISBN 978-0-08-092408-3. https://books.google.com/books?id=9AKPpSxiN4IC
↑ Bennett, Jeffrey (2014). What Is Relativity?