Hartfiel, D. J.; Maxson, C. J. Constructing the maximal monoids in the semigroups \(N_n\), \(S_n\), and \(\Omega_n\). (English) Zbl 0326.20060 Compos. Math. 32, 41-52 (1976). MSC: 20M99 15A30 20H99 PDFBibTeX XMLCite \textit{D. J. Hartfiel} and \textit{C. J. Maxson}, Compos. Math. 32, 41--52 (1976; Zbl 0326.20060) Full Text: Numdam EuDML
Flor, P. On groups of non-negative matrices. (English) Zbl 0194.34005 Compos. Math. 21, 376-382 (1969). PDFBibTeX XMLCite \textit{P. Flor}, Compos. Math. 21, 376--382 (1969; Zbl 0194.34005) Full Text: Numdam EuDML