Allied Pub. , 1976
Buku Teks
Sakhnovich, Lev A.
Springer, 2012
eBooks
Siregar, Porkas M.
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1990
UI - Skripsi (Membership)
Hochstadt, Harry
John Wiley & Sons, 1973
Buku Teks
Wing, G.M., 1923-
Society for Industrial and Applied Mathematics, 1991
eBooks