no. 1
Eindeutigkeit der Lösungen der Gleichung x d +y d =ap
Compositio Mathematica, Tome 88 (1993) no. 1, pp. 25-38 
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     author = {Langmann, Klaus},
     title = {Eindeutigkeit der {L\"osungen} der {Gleichung} $x^d + y^d = ap$},
     journal = {Compositio Mathematica},
     pages = {25--38},
     year = {1993},
     publisher = {Kluwer Academic Publishers},
     volume = {88},
     number = {1},
     mrnumber = {1234975},
     zbl = {0782.11011},
     language = {de},
     url = {https://www.numdam.org/item/CM_1993__88_1_25_0/}
}
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Langmann, Klaus. Eindeutigkeit der Lösungen der Gleichung $x^d + y^d = ap$. Compositio Mathematica, Tome 88 (1993) no. 1, pp. 25-38. https://www.numdam.org/item/CM_1993__88_1_25_0/

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