1. D. R. Hughes, “Extended partial geometries: Dual 2-design,” Europ. J. Combin. 11 (5), 459–472 (1990).
2. A. E. Brouwer, A. M. Cohen, and A. Neumaier, Distance-Regular Graphs (Springer, Berlin, 1989).
3. A. A. Makhnev, “On the graphs with µ-subgraphs isomorphic to Ku×2,” Proc. Steklov Inst. Math., Suppl. 2, S169–S178 (2001).
4. T. Huang, “On quasi-semisymmetric designs,” in Finite Geometry and Combinatorics: Proceedings of the Third International Conference, Deinze, Belgium, 1997 (Ghent Univ., Ghent, 1997), pp. 63–65.
5. A. A. Makhnev, “On strongly regular graphs with k = 2µ and their extensions,” Sib. Math. J. 43 (3), 487–495 (2002).