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Dedicated to ProfessorReinhold Baer on the occasion of his sixtieth birthday
This research was partly supported by the U.S. Department of Army through its European Research Office.
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Eckmann, B., Hilton, P.J. Group-like structures in general categories II equalizers, limits, lengths. Math. Ann. 151, 150–186 (1963). https://doi.org/10.1007/BF01344176
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DOI: https://doi.org/10.1007/BF01344176