Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1997__123_1_178760, author = {Mark Pollicott and Richard Sharp}, title = {The {Circle} {Problem} on {Surfaces} of {Variable} {Negative} {Curvature.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {61--70}, publisher = {mathdoc}, volume = {123}, number = {1}, year = {1997}, zbl = {0876.58040}, url = {http://geodesic.mathdoc.fr/item/MOMA_1997__123_1_178760/} }
Mark Pollicott; Richard Sharp. The Circle Problem on Surfaces of Variable Negative Curvature.. Monatshefte für Mathematik, Tome 123 (1997) no. 1, pp. 61-70. http://geodesic.mathdoc.fr/item/MOMA_1997__123_1_178760/