@article{ITA_1999__33_6_535_0,
     author = {Morita, Kenichi and Margenstern, Maurice and Imai, Katsunobu},
     title = {Universality of reversible hexagonal cellular automata},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {535--550},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {6},
     year = {1999},
     mrnumber = {1747515},
     zbl = {0953.68099},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1999__33_6_535_0/}
}