Geodesic
On strongly regular graphs with m2 = qm3 and m3 = qm2
Serdica Mathematical Journal, Tome 37 (2011) no. 4, pp. 353-364.

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We say that a regular graph G of order n and degree r і 1 (which is not the complete graph) is strongly regular if there exist non-negative integers t and q such that |SiЗSj| = t for any two adjacent vertices i and j, and |SiЗSj| = q for any two distinct non-adjacent vertices i and j, where Sk denotes the neighborhood of the vertex k. Let l1 = r, l2 and l3 be the distinct eigenvalues of a connected strongly regular graph. Let m1 = 1, m2 and m3 denote the multiplicity of r, l2 and l3, respectively. We here describe the parameters n, r, t and q for strongly regular graphs with m2 = qm3 and m3 = qm2 for q = 2, 3, 4.
Keywords: Strongly Regular Graph, Conference Graph, Integral Graph 
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Lepovic, Mirko. On strongly regular graphs with m2 = qm3 and m3 = qm2. Serdica Mathematical Journal, Tome 37 (2011) no. 4, pp. 353-364. http://geodesic.mathdoc.fr/item/SMJ2_2011_37_4_a7/