Geodesic
On automorphisms of strongly regular graphs with $\lambda=0$ and $\mu=3$
Algebra i analiz, Tome 21 (2009) no. 5, pp. 138-154 
A. A. Makhnev; V. V. Nosov. On automorphisms of strongly regular graphs with $\lambda=0$ and $\mu=3$. Algebra i analiz, Tome 21 (2009) no. 5, pp. 138-154. http://geodesic.mathdoc.fr/item/AA_2009_21_5_a6/
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     title = {On automorphisms of strongly regular graphs with $\lambda=0$ and $\mu=3$},
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     number = {5},
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     url = {http://geodesic.mathdoc.fr/item/AA_2009_21_5_a6/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A strongly regular graph with $\lambda=0$ and $\mu=3$ is of degree $3$ or $21$. The automorphisms of prime order and the subgraphs of their fixed points are described for a strongly regular graph $\Gamma$ with parameters $(162,21,0,3)$. In particular, the inequality $|G/O(G)|\le 2$ holds true for $G=\operatorname{Aut}(\Gamma)$.

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