Author: Ryjáček, Zdeněk
- : Graphs with nonisomorphic vertex neighbourhoods of the first and second types. (English). Časopis pro pěstování matematiky, vol. 112 (1987), issue 4, pp. 390-394
- : On graphs with isomorphic, non-isomorphic and connected $N_2$-neighbourhoods. (English). Časopis pro pěstování matematiky, vol. 112 (1987), issue 1, pp. 66-79
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