Ulam, S. M. (1964). Problems in modern mathematics. John Wiley & Sons.
Tohutoru Kātū Chicago (17th ed.)Ulam, S. M. Problems in Modern Mathematics. Nueva York: John Wiley & Sons, 1964.
Tohutoro MLA (9th ed.)Ulam, S. M. Problems in Modern Mathematics. John Wiley & Sons, 1964.
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