The multiplicity of binary recurrences
Compositio Mathematica, Tome 40 (1980) no. 2, pp. 251-267. 
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     title = {The multiplicity of binary recurrences},
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     number = {2},
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     mrnumber = {563543},
     zbl = {0396.10005},
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     url = {http://archive.numdam.org/item/CM_1980__40_2_251_0/}
}
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Beukers, F. The multiplicity of binary recurrences. Compositio Mathematica, Tome 40 (1980) no. 2, pp. 251-267. http://archive.numdam.org/item/CM_1980__40_2_251_0/

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