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Karzel, Helmut; Pianta, Silvia; Zizioli, Elena Loops, reflection structures and graphs with parallelism. (English) Zbl 1046.20043 Result. Math. 42, No. 1-2, 74-80 (2002). Reviewer: Heinrich Wefelscheid (Duisburg) MSC: 20N05 05C75 51A15 PDFBibTeX XMLCite \textit{H. Karzel} et al., Result. Math. 42, No. 1--2, 74--80 (2002; Zbl 1046.20043) Full Text: DOI