no. 2
Der 4-Werte-Satz in der Zahlentheorie
Compositio Mathematica, Tome 82 (1992) no. 2, pp. 137-142. 
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     number = {2},
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     url = {http://archive.numdam.org/item/CM_1992__82_2_137_0/}
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Langmann, Klaus. Der 4-Werte-Satz in der Zahlentheorie. Compositio Mathematica, Tome 82 (1992) no. 2, pp. 137-142. http://archive.numdam.org/item/CM_1992__82_2_137_0/

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