@article{3280, author = {Ribenboim, P. and McDaniel, W.L.}, title = {Square classes of Lucas sequences}, journal = {Portugaliae mathematica}, volume = {48}, year = {1991}, pages = {469-473}, zbl = {0760.11005}, mrnumber = {1147611}, language = {en}, url = {http://dml.mathdoc.fr/item/3280} }
Ribenboim, P.; McDaniel, W.L. Square classes of Lucas sequences. Portugaliae mathematica, Tome 48 (1991) pp. 469-473. http://gdmltest.u-ga.fr/item/3280/