tenseur de Ricci

[1991] The rejection of the ricci tensor in Einstein's first tensorial theory of gravitation ; Giulio Maltese ; Archive for history of exact sciences 41 (1991) p. 363 [lien]
[1995] The Ricci tensor of a diagonal metric ; J. B. Boyling ; American Journal of Physics 63 (fev 1995) p. 168 [lien]