@article{ELMA_1987__42_4_141409,
     author = {Shoichi Hirose},
     title = {The diophantine equation (x2 - 1) (y2 - 1) =  (z2 - 1)2: a footnote.},
     journal = {Elemente der Mathematik},
     pages = {109--109},
     year = {1987},
     volume = {42},
     number = {4},
     zbl = {0699.10027},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141409/}
}