@article{CTGDC_1993__34_3_185_0,
     author = {Herrlich, Horst},
     title = {On the failure of {Birkhoff's} theorem for locally small based equational categories of algebras},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {185--192},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {34},
     number = {3},
     year = {1993},
     mrnumber = {1239467},
     zbl = {0797.08006},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1993__34_3_185_0/}
}