1. Bray, J., Holt, D., Roney-Dougal, C.: The Maximal Subgroups of the Low-Dimensional Finite Classical Groups, (London Mathematical Society Lecture Note Series). Cambridge University Press, Cambridge (2013)
2. Brouwer, A.E.: Strongly regular graphs. In: Colbourn, C.J., Dinitz, J.H. (eds.) Handbook of Combinatorial Designs, 2nd edn, pp. 852–868. Chapman & Hall/CRC, Boca Raton (2007)
3. Brouwer, A.E.: Parameters of Strongly Regular Graphs. http://www.win.tue.nl/~aeb/graphs/srg/srgtab.html. Accessed 26 Dec 2019
4. Crnković, D., Rukavina, S., Švob, A.: New strongly regular graphs from orthogonal groups $$O^+(6,2)$$ and $$O^-(6,2)$$. Discret. Math. 341(10), 2723–2728 (2018)
5. Hirschfeld, J.W.P.: Finite Projective Spaces of Three Dimensions. Oxford Mathematical Monographs. Oxford Science Publications. The Clarendon Press, Oxford University Press, New York (1985)