"Toshiaki Hattori","Geometry of Quotient Spaces of SO(3)\(3,R) by congruence Subgroups",,"Math.Ann.,",,,"No. 293","pp. 433-467",1992, "服部俊昭","SO(3)\SL(3,R)の合同部分群による商空間の幾何",,,,,,,1992,