@article{CTGDC_1988__29_3_175_0,
     author = {Ad\'amek, J. and Herrlich, H. and Rosick\'y, J.},
     title = {Essentially equational categories},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {175--192},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {29},
     number = {3},
     year = {1988},
     mrnumber = {975371},
     zbl = {0659.18010},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1988__29_3_175_0/}
}