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References:
[1] БEЛOУCOB B. A.: Ocнoвы тeopии квaзигpyпп и лyп. Mocквa 1967.
[2] ORE O.: Theory of Graphs. Providence 1962. MR 0150753 | Zbl 0105.35401
[З] ZELINKA B.: Isotopy of digraphs. Czech. Math. J., 22, 1972, 353-360. MR 0306037 | Zbl 0239.05118
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