MathSciNet bibliographic data MR2390505 (2008m:11091) 11F06 (20H05 20H10 22E40) Petersen, Kathleen L. Counting cusps of subgroups of ${\rm PSL}\sb 2({\scr O}\sb K)$${\rm PSL}\sb 2({\scr O}\sb K)$. Proc. Amer. Math. Soc. 136 (2008), no. 7, 2387–2393. Article

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