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To Helmut Wielandt, on his sixtieth birthday, 19 December, 1970
This paper was completed while the first author was a member of the Department of Pure Mathematics (SGS) of the Australian National University.
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Dey, I.M.S., Neumann, H. The Hopf property of free products. Math Z 117, 325–339 (1970). https://doi.org/10.1007/BF01109851
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DOI: https://doi.org/10.1007/BF01109851