Open Access
1991 On some discrete reflection groups and congruence subgroups
Keiji Matsumoto, Masaaki Yoshida
Proc. Japan Acad. Ser. A Math. Sci. 67(4): 125-127 (1991). DOI: 10.3792/pjaa.67.125
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Vol.67 • No. 4 • 1991
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