MathSciNet bibliographic data MR1953568 (2003k:16045) 16U60 (16S34) Olivieri, Aurora; del Río, Ángel Bicyclic units of \$\Bbb ZS\sb n\$$\Bbb ZS\sb n$. Proc. Amer. Math. Soc. 131 (2003), no. 6, 1649–1653 (electronic). Article

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