Geodesic
Small $AT4$-graphs and strongly regular subgraphs corresponding to them
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 22 (2016) no. 1, pp. 220-230

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Let $\mathcal M$ be the class of strongly regular graphs for which $\mu$ is a nonprincipal eigenvalue. Note that the neighborhood of any vertex of an $AT4$-graph lies in $\mathcal M$. Parameters of graphs from $\mathcal M$ were described earlier. We find intersection arrays of small $AT4$-graphs and of strongly regular graphs corresponding to them.
Keywords: strongly regular graph, $AT4$-graph, locally $\mathcal M$-graphs. 
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     author = {A. A. Makhnev and D. V. Paduchikh},
     title = {Small $AT4$-graphs and strongly regular subgraphs corresponding to them},
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     url = {http://geodesic.mathdoc.fr/item/TIMM_2016_22_1_a19/}
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A. A. Makhnev; D. V. Paduchikh. Small $AT4$-graphs and strongly regular subgraphs corresponding to them. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 22 (2016) no. 1, pp. 220-230. http://geodesic.mathdoc.fr/item/TIMM_2016_22_1_a19/