@article {MR1062797,
    AUTHOR = {Lind, Douglas and Schmidt, Klaus and Ward, Tom},
     TITLE = {Mahler measure and entropy for commuting automorphisms of
              compact groups},
   JOURNAL = {Invent. Math.},
  FJOURNAL = {Inventiones Mathematicae},
    VOLUME = {101},
      YEAR = {1990},
    NUMBER = {3},
     PAGES = {593--629},
      ISSN = {0020-9910},
     CODEN = {INVMBH},
   MRCLASS = {22D40 (28D20)},
  MRNUMBER = {MR1062797 (92j:22013)},
MRREVIEWER = {Meir Smorodinsky},
}