An abstract setting for homotopy pushouts and pullbacks
Spencer, Christopher B.
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 18 (1977), p. 409-429 / Harvested from Numdam
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@article{CTGDC_1977__18_4_409_0,
     author = {Spencer, Christopher B.},
     title = {An abstract setting for homotopy pushouts and pullbacks},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     volume = {18},
     year = {1977},
     pages = {409-429},
     mrnumber = {486054},
     zbl = {0378.18008},
     language = {en},
     url = {http://dml.mathdoc.fr/item/CTGDC_1977__18_4_409_0}
}

Spencer, Christopher B. An abstract setting for homotopy pushouts and pullbacks. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 18 (1977) pp. 409-429. http://gdmltest.u-ga.fr/item/CTGDC_1977__18_4_409_0/

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