June 1941 Khintchine’s problem in metric Diophantine approximation
R. J. Duffin, A. C. Schaeffer
Duke Math. J. 8(2): 243-255 (June 1941). DOI: 10.1215/S0012-7094-41-00818-9
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Vol.8 • No. 2 • June 1941
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