MathSciNet bibliographic data MR1165372 (93h:22010) 22D40 (22B99 22C05) Ward, T. B. Periodic points for expansive actions of ${\bf Z}\sp d$${\bf Z}\sp d$ on compact abelian groups. Bull. London Math. Soc. 24 (1992), no. 4, 317–324. Article

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