@article{ITA_1979__13_3_241_0,
     author = {Culik II, K. and Maurer, H. A.},
     title = {On simple representations of language families},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {241--250},
     publisher = {EDP-Sciences},
     volume = {13},
     number = {3},
     year = {1979},
     mrnumber = {554685},
     zbl = {0432.68052},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1979__13_3_241_0/}
}