@article{COMIM_1999_7_1_a7,
     author = {Sasaki, Ryuji},
     title = {An arithmetic of modular function fields of degree two},
     journal = {Communications in Mathematics},
     pages = {79--105},
     year = {1999},
     volume = {7},
     number = {1},
     mrnumber = {1724136},
     zbl = {1024.11031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_1999_7_1_a7/}
}