@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://archive.numdam.org/item/CM_1980__40_2_251_0/}
}