Chua, K.S.K.S.ChuaLang, M.L.M.L.LangYI-FAN YANG2019-10-282019-10-282004https://scholars.lib.ntu.edu.tw/handle/123456789/428628On Rademacher's conjecture: Congruence subgroups of genus zero of the modular groupjournal article10.1016/j.jalgebra.2004.02.0252-s2.0-3142721147https://www.scopus.com/inward/record.uri?eid=2-s2.0-3142721147&doi=10.1016%2fj.jalgebra.2004.02.025&partnerID=40&md5=af29ed3c87645c5d154a88636e55c5cd