@article{CTGDC_1977__18_4_430_0,
     author = {Brown, R. and Spencer, C. B.},
     title = {Erratum \`a l'article {\guillemotleft} {Double} groupoids and crossed modules {\guillemotright}},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {430--430},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {18},
     number = {4},
     year = {1977},
     mrnumber = {464237},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1977__18_4_430_0/}
}