MathSciNet bibliographic data MR2231894 20E06 (57M07) Calegari, Danny; Dunfield, Nathan M. An ascending HNN extension of a free group inside ${\rm SL}_2\Bbb C$${\rm SL}_2\Bbb C$. Proc. Amer. Math. Soc. 134 (2006), no. 11, 3131–3136. Article

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