@article{ITA_2006__40_2_277_0,
     author = {Anselmo, Marcella and Giammarresi, Dora and Madonia, Maria and Restivo, Antonio},
     title = {Unambiguous recognizable two-dimensional languages},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {277--293},
     publisher = {EDP-Sciences},
     volume = {40},
     number = {2},
     year = {2006},
     doi = {10.1051/ita:2006008},
     mrnumber = {2252639},
     zbl = {1112.68085},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2006008/}
}