@article{10_21136_CMJ_1982_101832,
     author = {Novotn\'y, Miroslav},
     title = {Contextual grammars vs. context-free algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {529--547},
     publisher = {mathdoc},
     volume = {32},
     number = {4},
     year = {1982},
     doi = {10.21136/CMJ.1982.101832},
     mrnumber = {682130},
     zbl = {0534.68050},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1982.101832/}
}