@article{01483975,
title = {Atkin's theorem on pseudo-squares.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {64(78)},
year = {1998},
pages = {21-25},
zbl = {0945.11007},
language = {en},
url = {http://dml.mathdoc.fr/item/01483975}
}
Balasubramanian, R.; Ramana, D.S. Atkin's theorem on pseudo-squares.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 64(78) (1998) pp. 21-25. http://gdmltest.u-ga.fr/item/01483975/