@article{GDZPPN00208158X,
title = {On a diophantine equation (x2 - 1) (y2 - 1) = (z2 - 1)2.},
journal = {Elemente der Mathematik},
volume = {42},
year = {1987},
pages = {1-3},
zbl = {0699.10027},
url = {http://dml.mathdoc.fr/item/GDZPPN00208158X}
}
Hirose, Shoichi. On a diophantine equation (x2 - 1) (y2 - 1) = (z2 - 1)2.. Elemente der Mathematik, Tome 42 (1987) pp. 1-3. http://gdmltest.u-ga.fr/item/GDZPPN00208158X/