@article{GDZPPN002444593, title = {Length spectra of the Hecke triangle groups.}, journal = {Mathematische Zeitschrift}, volume = {220}, year = {1995}, pages = {369-398}, zbl = {0840.11019}, url = {http://dml.mathdoc.fr/item/GDZPPN002444593} }
Schmidt, Thomas A.; Sheingorn, Mark. Length spectra of the Hecke triangle groups.. Mathematische Zeitschrift, Tome 220 (1995) pp. 369-398. http://gdmltest.u-ga.fr/item/GDZPPN002444593/