@article{PORMA_1991__48_4_115770,
     author = {Ribenboim, P. and McDaniel, W.L.},
     title = {Square classes of {Lucas} sequences},
     journal = {Portugaliae mathematica},
     pages = {469--473},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {1991},
     mrnumber = {1147611},
     zbl = {0760.11005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1991__48_4_115770/}
}