@article{GDZPPN00207706X, title = {Sur l'\'equation diophantienne (x2-1)2 + (y2-1)2 = (z2-1)2.}, journal = {Elemente der Mathematik}, volume = {24}, year = {1969}, pages = {134-135}, zbl = {0188.34502}, url = {http://dml.mathdoc.fr/item/GDZPPN00207706X} }
Blanpain, M.E. Sur l'équation diophantienne (x2-1)2 + (y2-1)2 = (z2-1)2.. Elemente der Mathematik, Tome 24 (1969) pp. 134-135. http://gdmltest.u-ga.fr/item/GDZPPN00207706X/