Geodesic
Graphs in which each pair of vertices has exactly two common neighbours
Mathematica Bohemica, Tome 118 (1993) no. 2, pp. 163-165.

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The paper studies graphs in which each pair of vertices has exactly two common neighbours. It disproves a conjectury by P. Hliněný concerning these graphs.
DOI : 10.21136/MB.1993.126053
Classification : 05C40, 05C75
Keywords: connected graphs; adjacency in a graph; regular graph; wheel 
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Zelinka, Bohdan. Graphs in which each pair of vertices has exactly two common neighbours. Mathematica Bohemica, Tome 118 (1993) no. 2, pp. 163-165. doi : 10.21136/MB.1993.126053. http://geodesic.mathdoc.fr/articles/10.21136/MB.1993.126053/

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