Iosifescu, Marius
John Wiley & Sons, 1980
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Bharucha-Reid, A.T., editor
McGraw-Hill , 1960
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Isaacson, Dean L.
John Wiley & Sons, 1976
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Hanson, Floyd B.
Society for Industrial and Applied Mathematics, 2007
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Lee, T.C.
North-Holland, 1977
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