@article{bwmeta1.element.bwnjournal-article-aav14i4p347bwm,
author = {Mordell, L.},
title = {The Diophantine equation $x^4 + y^4 = 1$ in algebraic number fields},
journal = {Acta Arithmetica},
volume = {13},
year = {1968},
pages = {347-355},
zbl = {0191.04904},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav14i4p347bwm}
}
Mordell, L. The Diophantine equation $x^4 + y^4 = 1$ in algebraic number fields. Acta Arithmetica, Tome 13 (1968) pp. 347-355. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav14i4p347bwm/