Abdallah, M. El-Ghali M.; Gab-Alla, L. N.; Elagan, Sayed K. M. On semilattices of groups whose arrows are epimorphisms. (English) Zbl 1145.20029 Int. J. Math. Math. Sci. 2006, No. 9, 30673, 26 p. (2006). Reviewer: Václav Koubek (Praha) MSC: 20M10 20M50 20M17 PDFBibTeX XMLCite \textit{M. E. G. M. Abdallah} et al., Int. J. Math. Math. Sci. 2006, No. 9, 30673, 26 p. (2006; Zbl 1145.20029) Full Text: DOI EuDML
Abd-Allah, A. M.; Abdallah, M. E.-G. M. Congruences on Clifford semigroups. (English) Zbl 0735.20037 Pure Math. Manuscr. 7, 19-35 (1988). MSC: 20M17 20M15 08A55 08A62 PDFBibTeX XMLCite \textit{A. M. Abd-Allah} and \textit{M. E. G. M. Abdallah}, Pure Math. Manuscr. 7, 19--35 (1988; Zbl 0735.20037)