1. Fonctions périodique et formule des traces de Selberg sur les arbres;Ahumada;C. R. Acad. Sci. Paris,1987
2. Modern Graph Theory;Bollobás,1998
3. Cubic graphs;Greenlaw;ACM Comput. Surv.,1995
4. On discrete subgroup of the two by two projective linear group over p-adic field;Ihara;J. Math. Soc. Japan,1996
5. Discrete Computational Structures;Korfhage,1984