Hell, Pavol; Rival, Ivan Absolute retracts and varieties of reflexible graphs. (English) Zbl 0627.05039 Can. J. Math. 39, No. 3, 544-567 (1987). Reviewer: J.Širáň MSC: 05C99 PDFBibTeX XMLCite \textit{P. Hell} and \textit{I. Rival}, Can. J. Math. 39, No. 3, 544--567 (1987; Zbl 0627.05039) Full Text: DOI
Hell, Pavol; Nešetřil, Jaroslav Groups and monoids of regular graphs (and of graphs with bounded degrees). (English) Zbl 0253.05126 Can. J. Math. 25, 239-251 (1973). MSC: 05C25 20B25 PDFBibTeX XMLCite \textit{P. Hell} and \textit{J. Nešetřil}, Can. J. Math. 25, 239--251 (1973; Zbl 0253.05126) Full Text: DOI