@article{1998-balasubramanian
,author={R. Balasubramanian and D. S. Ramana}
,ISSN={0350--1302}
,journal={Institut Math\'e\-matique, Publications, Nouvelle S\'erie}
,MR={99e:11012}
,pages={21--25}
,title={{Atkin's theorem on pseudo-squares}}
,volume={63}
,year={1998}
}