MathSciNet bibliographic data MR1372041 55N25 (55P10) Mukherjee, Goutam Hopfian and co-Hopfian $G$$G$-${\rm CW}$${\rm CW}$-complexes. Proc. Amer. Math. Soc. 125 (1997), no. 4, 1229–1236. Article

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