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References:
[1] BERGE, O: Théorie des graphes et ses applications. Dunod, Paris 1958. MR 0102822
[2] BOSÁK J.: The graphs of semigroups. In: Theory of Graphs and its Applications. Proc. Symposium Smolenice, June 1963, Praba 1964. MR 0173718
[3] ZELINKA B.: Intersection graphs of lattices. Mat. Čas., 23, 1973, 216-222. MR 0327599 | Zbl 0267.06002
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