Nivat, M.; Perrot, J.-F. Une généralisation du monoide bicyclique. (French) Zbl 0206.30304 C. R. Acad. Sci., Paris, Sér. A 271, 824-827 (1970). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 ReviewsCited in 52 Documents MSC: 20M05 Free semigroups, generators and relations, word problems PDFBibTeX XMLCite \textit{M. Nivat} and \textit{J. F. Perrot}, C. R. Acad. Sci., Paris, Sér. A 271, 824--827 (1970; Zbl 0206.30304)