@article{ITA_1986__20_1_89_0,
     author = {Ehrenfeucht, A. and Rozenberg, G.},
     title = {Each regular code is included in a maximal regular code},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {89--96},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {20},
     number = {1},
     year = {1986},
     mrnumber = {849968},
     zbl = {0609.68053},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1986__20_1_89_0/}
}