@article{CTGDC_1987__28_3_235_0,
     author = {Porst, Hans-E.},
     title = {On free topological algebras},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {235--253},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {28},
     number = {3},
     year = {1987},
     mrnumber = {923631},
     zbl = {0658.54025},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1987__28_3_235_0/}
}