@article{PORMA_1989__46_2_115659,
     author = {Ribenboim, P.},
     title = {Square classes of {Fibonacci} and {Lucas} numbers},
     journal = {Portugaliae mathematica},
     pages = {159--175},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1989},
     mrnumber = {1020964},
     zbl = {0687.10005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_2_115659/}
}