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Complex Numbers from A to ...Z
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104 Number Theory Problems: From the Training of the USA IMO Team
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360 Problems for Mathematical Contests by Titu Andreescu
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Number Theory: A Problem-Solving Approach
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An Introduction to Diophantine Equations
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Quadratic Diophantine Equations (Springer Monographs in Mathematics)
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Recurrent Sequences: Key Results, Applications, and Problems (Problem Books in Mathematics)
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