edited by Bert Hubbard
Academic Press, 1971
Buku Teks SO
Petrovsky, I. G. (Ivan Georgievich)
Dover, 1991
Buku Teks
edited by Luis A. Caffarelli, Xavier Cabre, Juan Soler
Springer, 2012
eBooks
John, Fritz
Springer, 1982
Buku Teks SO
Fried, Isaac
Academic Press, 1979
Buku Teks