↑ Rovelli, C. (2001). "Notes for a brief history of quantum gravity". arΧiv:gr-qc/0006061 [gr-qc].
↑ Blokhintsev, D. I.; Gal'perin, F. M. (1934). "Gipoteza neitrino i zakon sokhraneniya energii". Pod Znamenem Marxisma (ภาษารัสเซีย). 6: 147–157. Unknown parameter |trans_title= ignored (help)