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3530 Harvey, 163-198.

M. Coornaert/A. Papadopoulos: Symbolic dynamics and hyperbolic groups.
SLN Math. 1539 (1993), 140p. 3-540-56499-3. DM 34.

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P. Nicholls: The ergodic theory of discrete groups.
Cambridge UP 1989. Pds. 20.

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William Veech: Flat surfaces. Am. J. Math. 115 (1993), 589-689.    

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SLN Math. 875 (1981).

8367 Heiner Zieschang/E. Vogt/H. Coldewey: Flaechen und ebene
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