Raghunathan, M. S. The congruence subgroup problem. (English) Zbl 0819.20054 Ramanan, S. (ed.), Proceedings of the Hyderabad conference on algebraic groups held at the School of Mathematics and Computer/Information Sciences of the University of Hyderabad, India, December 1989. Madras: Manoj Prakashan. 465-494 (1991). Reviewer: H.Abels (Bielefeld) MSC: 20H05 22E40 20G10 20G25 20G30 11F06 PDFBibTeX XMLCite \textit{M. S. Raghunathan}, in: Proceedings of the Hyderabad conference on algebraic groups held at the School of Mathematics and Computer/Information Sciences of the University of Hyderabad, India, December 1989. Madras: Manoj Prakashan. 465--494 (1991; Zbl 0819.20054) Full Text: arXiv
Petrich, Mario The kernel relation for a retract extension of Brandt semigroups. (English) Zbl 0723.20040 Boll. Unione Mat. Ital., VII. Ser., B 5, No. 1, 1-19 (1991). Reviewer: P.M.Higgins (Colchester) MSC: 20M17 08A30 20M15 PDFBibTeX XMLCite \textit{M. Petrich}, Boll. Unione Mat. Ital., VII. Ser., B 5, No. 1, 1--19 (1991; Zbl 0723.20040) Full Text: EuDML
Petrich, Mario Congruence lattices of regular semigroups related to kernels and traces. (English) Zbl 0757.20019 Proc. Edinb. Math. Soc., II. Ser. 34, No. 2, 179-203 (1991). Reviewer: F.J.Pastijn (Milwaukee) MSC: 20M17 20M15 20M10 PDFBibTeX XMLCite \textit{M. Petrich}, Proc. Edinb. Math. Soc., II. Ser. 34, No. 2, 179--203 (1991; Zbl 0757.20019) Full Text: DOI
Seth, A. Congruences of a \(\Gamma\)-group. (English) Zbl 0746.20052 Soochow J. Math. 17, No. 2, 233-237 (1991). Reviewer: J.Duda (Brno) MSC: 20M99 20M10 08A30 PDFBibTeX XMLCite \textit{A. Seth}, Soochow J. Math. 17, No. 2, 233--237 (1991; Zbl 0746.20052)