MathSciNet bibliographic data MR1185094 (93k:58136) 58F11 (28D15 54H20 58F03) Kitchens, Bruce; Schmidt, Klaus Markov subgroups of $({\bf Z}/2{\bf Z})\sp {{\bf Z}\sp 2}$$({\bf Z}/2{\bf Z})\sp {{\bf Z}\sp 2}$. Symbolic dynamics and its applications (New Haven, CT, 1991), 265–283, Contemp. Math., 135, Amer. Math. Soc., Providence, RI, 1992. Article

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