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For Professor H. Hopf on his sixtieth birthday
The work on this note was supported by a grant from the National Science Foundation.
Institute for Advanced Study
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Samelson, H. Groups and spaces of loops. Commentarii Mathematici Helvetici 28, 278–287 (1954). https://doi.org/10.1007/BF02566934
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DOI: https://doi.org/10.1007/BF02566934