Geodesic
Strongly regular graphs with nonprincipal eigenvalue 4 and its extensions
Trudy Instituta matematiki, Tome 23 (2015) no. 2, pp. 82-87.

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J. Koolen suggested the problem of investigation distance-regular graphs with strongly regular local subgraphs having the second eigenvalue $\le t$ for some natural number $t$. Earlier the Koolen problem for $t=3$ was solved. In this paper it is developed the programm of investigation distance-regular graphs with strongly regular local subgraphs having the second eigenvalue $r,$ $3$. 
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A. A. Makhnev. Strongly regular graphs with nonprincipal eigenvalue 4 and its extensions. Trudy Instituta matematiki, Tome 23 (2015) no. 2, pp. 82-87. http://geodesic.mathdoc.fr/item/TIMB_2015_23_2_a10/

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