@article{CTGDC_1991__32_2_165_0,
     author = {Hilken, B. and Rydeheard, D. E.},
     title = {Indexed categories for program development},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {165--185},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {32},
     number = {2},
     year = {1991},
     mrnumber = {1142689},
     zbl = {0746.03019},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1991__32_2_165_0/}
}