Anselmo, Marcella; Madonia, Maria Classes of two-dimensional languages and recognizability conditions. (English) Zbl 1211.68230 RAIRO, Theor. Inform. Appl. 44, No. 4, 471-488 (2010). MSC: 68Q45 68Q70 PDFBibTeX XMLCite \textit{M. Anselmo} and \textit{M. Madonia}, RAIRO, Theor. Inform. Appl. 44, No. 4, 471--488 (2010; Zbl 1211.68230) Full Text: DOI EuDML Link
Schneider, Johannes C. Unambiguous erasing morphisms in free monoids. (English) Zbl 1203.68132 RAIRO, Theor. Inform. Appl. 44, No. 2, 193-208 (2010). MSC: 68R15 68Q25 PDFBibTeX XMLCite \textit{J. C. Schneider}, RAIRO, Theor. Inform. Appl. 44, No. 2, 193--208 (2010; Zbl 1203.68132) Full Text: DOI EuDML Link