Rabounski, Dmitri, author
Hexis, 2005
Buku Teks
Wald, Robert M., author
University of Chicago Press, 1984
Buku Teks
Das, Anadijiban
Springer, 2012
eBooks
Gourgoulhon, Eric, author
Springer, 2012
eBooks
Dirac, P. A. M.
John Wiley & Sons, 1975
Buku Teks