Torsion and closed geodesics on complex hyperbolic manfolds. David Fried — 1988 Inventiones mathematicae
Flow equivalence, hyperbolic systems and a new zeta function for flows. David Fried — 1982 Commentarii mathematici Helvetici
The zeta functions of Ruelle and Selberg. I David Fried — 1986 Annales scientifiques de l'École Normale Supérieure
Entropy linearity and chain-recurrence David Fried; Michael Shub — 1979 Publications Mathématiques de l'IHÉS