@article{JTNB_2009__21_3_721_0, author = {Yiannis N. Petridis and Morten S. Risager}, title = {Hyperbolic lattice-point counting and modular symbols}, journal = {Journal de th\'eorie des nombres de Bordeaux}, pages = {721--734}, publisher = {Universit\'e Bordeaux 1}, volume = {21}, number = {3}, year = {2009}, doi = {10.5802/jtnb.698}, zbl = {1214.11065}, mrnumber = {2605543}, language = {en}, url = {https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.698/} }