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HOMOTOPY RINGOIDS AND HOMOTOPY GROUPS M. G. BARRATT M. G. BARRATT Oxford Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Mathematics, Volume 5, Issue 1, 1954, Pages 271–290, https://doi.org/10.1093/qmath/5.1.271 Published: 01 January 1954 Article history Published: 01 January 1954 Received: 17 February 1954 Revision received: 20 August 1954
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M. G. Barratt (Fri,) studied this question.
synapsesocial.com/papers/69d7be7b05ee2ba81dbed98e — DOI: https://doi.org/10.1093/qmath/5.1.271
M. G. Barratt
Northwestern University
The Quarterly Journal of Mathematics
Science Oxford
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