Author: Bielak, Halina
- : On graphs with nonisomorphic $2$-neighbourhoods. (English). Časopis pro pěstování matematiky, vol. 108 (1983), issue 3, pp. 294-298
- : Some remarks about digraphs with nonisomorphic $1$- or $2$-neighbourhoods. (English). Časopis pro pěstování matematiky, vol. 108 (1983), issue 3, pp. 299-304
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