Kurtz, Thomas G.
Society for Industrial and Applied Mathematics, 1981
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Iosifescu, Marius
John Wiley & Sons, 1980
Buku Teks
Isaacson, Dean L.
John Wiley & Sons, 1976
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Bharucha-Reid, A.T., editor
McGraw-Hill , 1960
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Williams, David
John Wiley & Sons, 1979
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