@article{hal-01108770,
author = {Velammal, G},
title = {Is the binomial coefficient $2n \choose n$ square free?},
journal = {HAL},
volume = {1995},
number = {0},
year = {1995},
language = {en},
url = {http://dml.mathdoc.fr/item/hal-01108770}
}
Velammal, G. Is the binomial coefficient $2n \choose n$ square free?. HAL, Tome 1995 (1995) no. 0, . http://gdmltest.u-ga.fr/item/hal-01108770/