@article{CTGDC_1999__40_3_221_0,
     author = {Herrlich, Horst and Schr\"oder, Lutz},
     title = {Composing special epimorphisms and retractions},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {221--226},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {40},
     number = {3},
     year = {1999},
     mrnumber = {1716778},
     zbl = {0941.18003},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1999__40_3_221_0/}
}