Keddy, Paul A.
Chapman & Hall, 1989
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Waltman, Paul, author
Society for Industrial and Applied Mathematics, 1983
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Taylor, Paul M.
Sweet &Maxwell, 1999
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Keedy, Mervin L., author
Addison-Wesley, 1966
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Siahaan, Janpie, author
Salemba Empat, 2009
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