Niven, Ivan Morton, 1915-
An Introduction to the theory of numbers
John Wiley & Sons, 1980
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Niven, Ivan Morton, 1915-
An introduction to the theory of numbers
John Wiley & Sons, 1991
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Shapiro, Harold N.
Introduction to the theory of numbers
John Wiley & Sons, 1983
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Christofides, Nicos
Graph theory : an algorithmic approach
Academic Press, 1975
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Chartrand, Gary
Applied and algorithmic graph theory
McGraw-Hill, 1993
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