Geodesic
Pseudo-geometric graphs of the partial geometries $pG_2(4,t)$
Diskretnaya Matematika, Tome 12 (2000) no. 1, pp. 113-134.

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We prove that a strongly regular graph $\Gamma$ with parameters $$ (10t+5,4t+4,t+3,2t+2), $$ which contains a bad triple coincides with the graph $T(6)$ or with $\bar J(8,4)$. We say that a triple of vertices is bad if these vertices are not pairwise adjacent and the intersection of their neighbourhoods is empty. As a corollary, we establish the fact that any $\lambda$-subgraph of $\Gamma$ consists of isolated vertices and triangles. This research was supported by the Russian Foundation for Basic Research, grant 99–01–00462. 
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A. A. Makhnev. Pseudo-geometric graphs of the partial geometries $pG_2(4,t)$. Diskretnaya Matematika, Tome 12 (2000) no. 1, pp. 113-134. http://geodesic.mathdoc.fr/item/DM_2000_12_1_a9/

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