Mukherjee, Goutam2017-06-012017-06-011997Proceedings of the American Mathematical Society, vol.125, no.4, p.1229-1236http://hdl.handle.net/10263/6793enMorphismsHomomorphismsQuaternionsTrivial groupsMathematical objectsHomotopy theoryHopfian and co-hopfian g-cw-complexesArticle