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References:
[1] Theory of graphs and its applications. Proc. Symp. Smolenice 1963, Academia Prague 1964.
[2] J. Sedláček: Local pгoperties of graphs. (Czech). Časopis pěst. mat. 106 (1981), 290-298. MR 0629727
[3] L. Szamkolowicz: On a classification of graphs with respect to the properties of neighbourhood gгaphs. In: Finite and Infinite Sets (Eger 1981), North-Holland 1984, 675-678. MR 0818269
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