@article{CTGDC_1979__20_3_281_0,
     author = {Howie, James},
     title = {Pullback functors and crossed complexes},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {281--296},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {20},
     number = {3},
     year = {1979},
     mrnumber = {557084},
     zbl = {0429.18007},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1979__20_3_281_0/}
}