no. 1
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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     author = {Hardie, K. A. and Kamps, K. H.},
     title = {Exact sequence interlocking and free homotopy theory},
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     pages = {3--31},
     year = {1985},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {26},
     number = {1},
     mrnumber = {794414},
     zbl = {0574.55012},
     language = {en},
     url = {https://www.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. https://www.numdam.org/item/CTGDC_1985__26_1_3_0/

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