Geodesic
On graphs in which neighborhoods of vertices are isomorphic to the Higman--Sims graph
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 17 (2011) no. 4, pp. 189-198

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The Higman–Sims graph is the unique strongly regular graph with parameters $(100,22,0,6)$. In this paper, amply regular graphs in which neighborhoods of vertices are isomorphic to the Higman–Sims graph are classified. This result continues the investigation of amply regular locally $\mathcal F$-graphs, where $\mathcal F$ is the class of strongly regular graphs without triangles.
Keywords: strongly regular graph, Higman–Sims graph, locally $\mathcal F$-graph. 
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     title = {On graphs in which neighborhoods of vertices are isomorphic to the {Higman--Sims} graph},
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A. A. Makhnev; D. V. Paduchikh. On graphs in which neighborhoods of vertices are isomorphic to the Higman--Sims graph. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 17 (2011) no. 4, pp. 189-198. http://geodesic.mathdoc.fr/item/TIMM_2011_17_4_a19/