William Bechtel, Pete Mandik
Blackwell, 2001
Buku Teks
Natanson, Maurice
Random House, 1963
Buku Teks
New York Cambridge University Press 1974
Buku Teks
Benarroch, Eduardo E.
Butterworth Heinemann, Elsevier, 2006
Buku Teks
Tuckwell, Henry C.
Society for Industrial and Applied Mathematics, 1989
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