Day, J. M. Compact semigroups with square roots. (English) Zbl 0214.03703 Pac. J. Math. 36, 623-630 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 4 Documents MSC: 20M99 Semigroups PDFBibTeX XMLCite \textit{J. M. Day}, Pac. J. Math. 36, 623--630 (1971; Zbl 0214.03703) Full Text: DOI