1. An introduction to infinite Ergodic theory;Aaronson,1997
2. Modular functions and Dirichlet series in number theory;Apostol,1976
3. The slow continued fraction algorithm via 2×2 integer matrices;Appelgate;Amer Math Monthly,1983
4. Ergodic theory and information;Billingsley,1965
5. Regular variation;Bingham,1987