MathSciNet bibliographic data MR1909651 (2003h:57045) 57S30 (20H10 30F45 51M10) Falbel, E.; Koseleff, P.-V. A circle of modular groups in ${\rm PU}(2,1)$${\rm PU}(2,1)$. Math. Res. Lett. 9 (2002), no. 2-3, 379–391. Article

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