MathSciNet bibliographic data MR788414 11F72 (58G25) Phillips, R. S.; Sarnak, P. On cusp forms for co-finite subgroups of ${\rm PSL}(2,{\bf R})$${\rm PSL}(2,{\bf R})$. Invent. Math. 80 (1985), no. 2, 339–364. Article

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