Ortega, James M., 1932- , author
Society for Industrial and Applied Mathematics, 1985
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edited by Bert Hubbard
Academic Press, 1971
Buku Teks
John, Fritz, author
Springer, 1982
Buku Teks
Petrovsky, I. G. (Ivan Georgievich), author
Dover, 1991
Buku Teks
edited by Luis A. Caffarelli, Xavier Cabre, Juan Soler
Springer, 2012
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