MathSciNet bibliographic data MR724426 (85c:13008) 13C05 (11R33) Levy, Lawrence S. Krull-Schmidt uniqueness fails dramatically over subrings of \$Z\oplus \cdots \oplus Z\$$Z\oplus \cdots \oplus Z$. Rocky Mountain J. Math. 13 (1983), no. 4, 659–678. Article

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