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References:
[1] Kypoш A. Г.: Лeкцuu пo oбщeй aлгeбpe. Mocквa 1962.
[2] Zelinka B.: Decomposition of a digraph into isomorphic subgraphs. Mat. časop. 20 (1970), 92-100. MR 0306036 | Zbl 0197.50504
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