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@article{CM_1980__40_2_251_0, author = {Beukers, F.}, title = {The multiplicity of binary recurrences}, journal = {Compositio Mathematica}, pages = {251--267}, publisher = {Sijthoff et Noordhoff International Publishers}, volume = {40}, number = {2}, year = {1980}, mrnumber = {563543}, zbl = {0396.10005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1980__40_2_251_0/} }
Beukers, F. The multiplicity of binary recurrences. Compositio Mathematica, Tome 40 (1980) no. 2, pp. 251-267. http://geodesic.mathdoc.fr/item/CM_1980__40_2_251_0/