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Fountain, John; Pin, Jean-Eric; Weil, Pascal Covers for monoids. (English) Zbl 1081.20069 J. Algebra 271, No. 2, 529-586 (2004). Reviewer: Jorge Almeida (Porto) MSC: 20M10 20M50 PDFBibTeX XMLCite \textit{J. Fountain} et al., J. Algebra 271, No. 2, 529--586 (2004; Zbl 1081.20069) Full Text: DOI