@article{01295597,
title = {On the lenth spectrums of non-compact Riemann surfaces.},
journal = {Annales Academiae Scientiarum Fennicae. Mathematica},
volume = {24},
year = {1999},
pages = {11-22},
zbl = {0924.32020},
language = {en},
url = {http://dml.mathdoc.fr/item/01295597}
}
Liu, Lixin. On the lenth spectrums of non-compact Riemann surfaces.. Annales Academiae Scientiarum Fennicae. Mathematica, Tome 24 (1999) pp. 11-22. http://gdmltest.u-ga.fr/item/01295597/