MathSciNet bibliographic data MR593633 (82b:10030) 10D12 (10D45 12A50 14G20) Yu, Jing A cuspidal class number formula for the modular curves \$X\sb{1}(N)\$$X\sb{1}(N)$. Math. Ann. 252 (1980), no. 3, 197–216. Article

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