@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/