An abstract setting for homotopy pushouts and pullbacks
Cahiers de topologie et géométrie différentielle, Volume 18 (1977) no. 4, pp. 409-429.
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author = {Spencer, Christopher B.},
title = {An abstract setting for homotopy pushouts and pullbacks},
journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
pages = {409--429},
publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
volume = {18},
number = {4},
year = {1977},
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language = {en},
url = {http://www.numdam.org/item/CTGDC_1977__18_4_409_0/}
}
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Spencer, Christopher B. An abstract setting for homotopy pushouts and pullbacks. Cahiers de topologie et géométrie différentielle, Volume 18 (1977) no. 4, pp. 409-429. http://www.numdam.org/item/CTGDC_1977__18_4_409_0/

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