Geodesic
On graphs the neighbourhoods of whose verticesare pseudo-geometric graphs for $GQ(3,3)$
Trudy Instituta matematiki, Tome 18 (2010) no. 1, pp. 28-35.

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Let $\mathcal{F}$ be a class of graphs. We call a graph $\Gamma$ a locally $\mathcal{F}$-graph if $[a]\in\mathcal{F}$ for every vertex $a$ of $\Gamma.$ Earlier for the class $\mathcal{F}$ consisting of pseudogeometrical graphs for $pG_{s-2}(s,t)$ the study of locally $\mathcal{F}$-graphs was reduced to investigating locally pseudo $GQ(3,t)$-graphs, $t\in\{3,5\}$. A description of completely regular locally pseudo $GQ(3,3)$-graphs is obtained in the paper. 
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A. K. Gutnova; A. A. Makhnev. On graphs the neighbourhoods of whose verticesare pseudo-geometric graphs for $GQ(3,3)$. Trudy Instituta matematiki, Tome 18 (2010) no. 1, pp. 28-35. http://geodesic.mathdoc.fr/item/TIMB_2010_18_1_a3/

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[4] Brouwer A.E., Haemers W.H., Spectra of graphs (course notes), http://www.win.tue.nl/aeb

[5] Brouwer A.E., Cohen A.M., Neumaier A., Distance-Regular Graphs, Springer-Verlag, Berlin etc., 1989 | MR