Exact sequence interlocking and free homotopy theory
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 26 (1985) no. 1, pp. 3-31. 
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     title = {Exact sequence interlocking and free homotopy theory},
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     number = {1},
     year = {1985},
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     url = {http://archive.numdam.org/item/CTGDC_1985__26_1_3_0/}
}
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Hardie, K. A.; Kamps, K. H. Exact sequence interlocking and free homotopy theory. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 26 (1985) no. 1, pp. 3-31. http://archive.numdam.org/item/CTGDC_1985__26_1_3_0/

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