%0 Journal Article %A Sasaki, Ryuji %T An arithmetic of modular function fields of degree two %J Communications in Mathematics %D 1999 %P 79-105 %V 07 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/COMIM_1999__7_1_a7/ %G en %F COMIM_1999__7_1_a7