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@article{MS2_1976__39_166501, author = {Ernst S. Selmer}, title = {On the number of prime divisors of a binomial coefficient.}, journal = {Mathematica Scandinavica}, pages = {271--281}, publisher = {mathdoc}, volume = {39}, year = {1976}, zbl = {0344.10003}, url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166501/} }
Ernst S. Selmer. On the number of prime divisors of a binomial coefficient.. Mathematica Scandinavica, Tome 39 (1976), pp. 271-281. http://geodesic.mathdoc.fr/item/MS2_1976__39_166501/