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References
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Molchanov V. A., “Semigroups of mappings on graphs”, Semigroup Forum, 27 (1983), 155–199     |
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Khvorostukhina E. V., “O polugruppakh endomorfizmov gipergrafov”, Sovr. problemy dif. geometrii i obschei algebry, Tez. dokl. Mezhdunar. nauch. konf., posvyasch. 100-letiyu prof.
V. V. Vagnera, Izd-vo Sarat. un-ta, Saratov, 2008, 136–137 |
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Zykov A. A., “Gipergrafy”, Uspekhi mat. nauk, 29:6 (1974), 89–154  |
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Klifford A., Preston G., Algebraicheskaya teoriya polugrupp. V 2 t., v. 1, Mir, M., 1972, 286 pp. |
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Khartskhorn R., Osnovy proektivnoi geometrii, Mir, M., 1970, 161 pp. |
