@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/}
}