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@article{EUG_1988__20_a7, author = {P. Ribenboim}, title = {On the {Square} {Factors} of the {Numbers} of {Fermat} and {Ferentinou-Nicolakopoulou}}, journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma} }, pages = {81-91}, publisher = {mathdoc}, volume = {20}, year = {1988}, language = {gr}, url = {http://geodesic.mathdoc.fr/item/EUG_1988__20_a7/} }
P. Ribenboim. On the Square Factors of the Numbers of Fermat and Ferentinou-Nicolakopoulou. Ευκλείδης Γ , Tome 20 (1988), p. 81-91. http://geodesic.mathdoc.fr/item/EUG_1988__20_a7/