@article{bwmeta1.element.bwnjournal-article-aav33i1p1bwm,
author = {Kenku, M.},
title = {Atkin-Lehner involutions and class number residuality},
journal = {Acta Arithmetica},
volume = {32},
year = {1977},
pages = {1-9},
zbl = {0314.12010},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav33i1p1bwm}
}
Kenku, M. Atkin-Lehner involutions and class number residuality. Acta Arithmetica, Tome 32 (1977) pp. 1-9. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav33i1p1bwm/