MathSciNet bibliographic data MR1555163 DML Arwin, A. Über die Lösung der Kongruenz $(\lambda+I)p-l\lambda p-I-o (mod p^2)$$(\lambda+I)p-l\lambda p-I-o (mod p^2)$. (German) Acta Math. 42 (1920), no. 1, 173–190. Article

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