Geodesic
Automorphisms of a Distance Regular Graph with Intersection Array $\{21,18,12,4;1,1,6,21\}$
Matematičeskie zametki, Tome 109 (2021) no. 2, pp. 247-256.

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A. A. Makhnev and M. S. Nirova found the intersection arrays of distance regular graphs with $\lambda=2$ and at most 4096 vertices. For graphs of diameter $4$, of most interest is the array $\{21,18,12,4;1,1,6,21\}$ in this list. In this paper, we find the possible orders and fixed point subgraphs of the automorphisms of a distance regular graph with intersection array $\{21,18,12,4;1,1,6,21\}$.
Keywords: distance regular graph, graph of diameter $4$ with $a_4=0$
Mots-clés : graph automorphism. 
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A. A. Makhnev. Automorphisms of a Distance Regular Graph with Intersection Array $\{21,18,12,4;1,1,6,21\}$. Matematičeskie zametki, Tome 109 (2021) no. 2, pp. 247-256. http://geodesic.mathdoc.fr/item/MZM_2021_109_2_a7/

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