Each regular code is included in a maximal regular code
Ehrenfeucht, A. ; Rozenberg, G.
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986), p. 89-96 / Harvested from Numdam
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@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},
     volume = {20},
     year = {1986},
     pages = {89-96},
     mrnumber = {849968},
     zbl = {0609.68053},
     language = {en},
     url = {http://dml.mathdoc.fr/item/ITA_1986__20_1_89_0}
}

Ehrenfeucht, A.; Rozenberg, G. Each regular code is included in a maximal regular code. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) pp. 89-96. http://gdmltest.u-ga.fr/item/ITA_1986__20_1_89_0/

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