@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/