レイチャウデューリ方程式
↑ Spacetime as a deformable solid, M. O. Tahim, R. R. Landim, and C. A. S. Almeida, arXiv:0705.4120v1.
↑ Dadhich, Naresh (August 2005). “Amal Kumar Raychaudhuri (1923–2005)”. Current Science 89: 569–570. http://www.ias.ac.in/currsci/aug102005/569.pdf.
↑ p. 84, The large scale structure of space-time, Stephen W. Hawking and G. F. R. Ellis, Cambridge University Press, 1973, ISBN 0-521-09906-4.