@article{ELMA_1987__42_4_141393,
     author = {Shoichi Hirose},
     title = {On a diophantine equation (x2 - 1) (y2 - 1) = (z2 - 1)2.},
     journal = {Elemente der Mathematik},
     pages = {1--3},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {1987},
     zbl = {0699.10027},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141393/}
}