@article{AFM_1999_24_1_a1,
     author = {Lixin Liu},
     title = {On the length spectrums of non-compact {Riemann} surfaces},
     journal = {Annales Fennici Mathematici},
     pages = {11--22},
     year = {1999},
     volume = {24},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1999_24_1_a1/}
}