@article{CTGDC_1979__20_2_179_0,
     author = {Brown, Ronald and Nickolas, Peter},
     title = {Exponential laws for topological categories, groupoids and groups, and mapping spaces of colimits},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {179--198},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {20},
     number = {2},
     year = {1979},
     mrnumber = {548488},
     zbl = {0416.18012},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1979__20_2_179_0/}
}