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MR1817768 (2002a:20029) 20E06 (20J06)
Geoghegan, Ross; Mihalik, Michael L.; Sapir, Mark; Wise, Daniel T. Ascending HNN extensions of finitely generated free groups are Hopfian. Bull. London Math. Soc. 33 (2001), no. 3, 292–298.
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