@article{1225114183, author = {Ulas, Maciej}, title = {On the Diophantine Equation $(x^2+k)(y^2+k)=(z^2+k)^2$}, journal = {Rocky Mountain J. Math.}, volume = {38}, number = {2}, year = {2008}, pages = { 2091-2097}, language = {en}, url = {http://dml.mathdoc.fr/item/1225114183} }
Ulas, Maciej. On the Diophantine Equation $(x^2+k)(y^2+k)=(z^2+k)^2$. Rocky Mountain J. Math., Tome 38 (2008) no. 2, pp. 2091-2097. http://gdmltest.u-ga.fr/item/1225114183/