@article {MR1165372,
    AUTHOR = {Ward, T. B.},
     TITLE = {Periodic points for expansive actions of {${\bf Z}\sp d$} on
              compact abelian groups},
   JOURNAL = {Bull. London Math. Soc.},
  FJOURNAL = {The Bulletin of the London Mathematical Society},
    VOLUME = {24},
      YEAR = {1992},
    NUMBER = {4},
     PAGES = {317--324},
      ISSN = {0024-6093},
     CODEN = {LMSBBT},
   MRCLASS = {22D40 (22B99 22C05)},
  MRNUMBER = {MR1165372 (93h:22010)},
MRREVIEWER = {Paul Milnes},
}