On the preservation of homotopy invariance by Kan extensions
Cahiers de topologie et géométrie différentielle, Tome 22 (1981) no. 3, pp. 329-336. 
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     author = {Frei, Armin},
     title = {On the preservation of homotopy invariance by {Kan} extensions},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {329--336},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {22},
     number = {3},
     year = {1981},
     mrnumber = {649080},
     zbl = {0486.18006},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1981__22_3_329_0/}
}
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Frei, Armin. On the preservation of homotopy invariance by Kan extensions. Cahiers de topologie et géométrie différentielle, Tome 22 (1981) no. 3, pp. 329-336. http://www.numdam.org/item/CTGDC_1981__22_3_329_0/

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