John, Fritz
Springer, 1982
Buku Teks
Petrovsky, I. G. (Ivan Georgievich)
Dover, 1991
Buku Teks
edited by Luis A. Caffarelli, Xavier Cabre, Juan Soler
Springer, 2012
eBooks
Farlow, Stanley J.
John Wiley & Sons, 1982
Buku Teks
Ames, William F.
Academic Press, 1977
Buku Teks