@article{ITA_2006__40_2_295_0,
     author = {Massazza, Paolo and Salmela, Petri},
     title = {On the simplest centralizer of a language},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {295--301},
     publisher = {EDP-Sciences},
     volume = {40},
     number = {2},
     year = {2006},
     doi = {10.1051/ita:2006014},
     mrnumber = {2252640},
     zbl = {1112.68097},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2006014/}
}