Roytvarf, Alexander A. Thinking in problems : how mathematicians find creative solutions / Alexander A. Roytvarf - New York : Springer-Birkhauser, c2013. - xxxvii, 405 p. : ill. ; 24 cm. ISBN: 9780817684051 LCCN: Subjects--Topical Terms: MathematicsPhilosophyMathematical analysis LC Class. No.: QA9 / .R777 2013