Geodesic
Three-class association schemes
Journal of Algebraic Combinatorics, Tome 10 (1999) no. 1, pp. 69-107.

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Summary: We study (symmetric) three-class association schemes. The graphs with four distinct eigenvalues which are one of the relations of such a scheme are characterized. We also give an overview of most known constructions, and obtain necessary conditions for existence. A list of feasible parameter sets on at most 100 vertices is generated.
Keywords: association scheme, graph, eigenvalue 
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     title = {Three-class association schemes},
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van Dam, Edwin R. Three-class association schemes. Journal of Algebraic Combinatorics, Tome 10 (1999) no. 1, pp. 69-107. http://geodesic.mathdoc.fr/item/JAC_1999__10_1_a0/