@article{10_4064_aa_88_2_129_140,
     author = {Yuji Hasegawa and Mahoro Shimura},
     title = {Trigonal modular curves},
     journal = {Acta Arithmetica},
     pages = {129--140},
     publisher = {mathdoc},
     volume = {88},
     number = {2},
     year = {1999},
     doi = {10.4064/aa-88-2-129-140},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-88-2-129-140/}
}