"There followed also the principle of the equivalence of mass and energy, with the laws of conservation of mass and energy becoming one and the same.", Albert Einstein, "Considerations Concerning the Fundaments of Theoretical Physics", Science, Washington, DC, vol. 91, no. 2369, May 24th, 1940 scanned image online
archive.org
Planck, Max (1907), "Zur Dynamik bewegter Systeme", Sitzungsberichte der Königlich-Preussischen Akademie der Wissenschaften, Berlin, Erster Halbband (29): 542–570
Schwartz, H. M. (1977), "Einstein's comprehensive 1907 essay on relativity, part II", American Journal of Physics, 45 (9): 811–817, Bibcode:1977AmJPh..45..811S, doi:10.1119/1.11053
Schwartz, H. M. (1977), "Einstein's comprehensive 1907 essay on relativity, part II", American Journal of Physics, 45 (9): 811–817, Bibcode:1977AmJPh..45..811S, doi:10.1119/1.11053
M.C.Shields Bibliography of the Writings of Albert Einstein to May 1951 in Albert Einstein: Philosopher-Scientist by Paul Arthur Schilpp (Editor) Albert Einstein Philosopher – Scientist
"Einstein was unequivocally against the traditional idea of conservation of mass. He had concluded that mass and energy were essentially one and the same; 'inert[ial] mass is simply latent energy.'[ref...]. He made his position known publicly time and again[ref...]...", Eugene Hecht, "Einstein on mass and energy." Am. J. Phys. , Vol. 77, No. 9, September 2009, online.
Planck, Max (1907), "Zur Dynamik bewegter Systeme", Sitzungsberichte der Königlich-Preussischen Akademie der Wissenschaften, Berlin, Erster Halbband (29): 542–570
