Gerko, A. I. Some generalizations of Galois theory of distal minimal extensions for semigroups of transformations. (Russian) Zbl 0726.20043 Mat. Issled. 118, 28-35 (1990). Reviewer: Ja.Henno (Naasa) MSC: 20M20 54H15 06A15 20M15 20M50 PDFBibTeX XMLCite \textit{A. I. Gerko}, Mat. Issled. 118, 28--35 (1990; Zbl 0726.20043) Full Text: EuDML
McMahon, Douglas C.; Nachman, Louis J. An intrinsic characterization for PI flows. (English) Zbl 0468.54033 Pac. J. Math. 89, 391-403 (1980). MSC: 54H20 PDFBibTeX XMLCite \textit{D. C. McMahon} and \textit{L. J. Nachman}, Pac. J. Math. 89, 391--403 (1980; Zbl 0468.54033) Full Text: DOI