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[2] P. Terwilliger, The subconstituent algebra of an association scheme II, J. Algebraic Comb., 2 (1993)73–103.
[3] P. Terwilliger, The subconstituent algebra of an association scheme III, J. Algebraic Comb., 3 (1993)177–210.
[4] P. Terwilliger, Algebraic Graph Theory, unpublished lecture notes taken by H.Suzuki.
[5] P. Terwilliger, Arjana Zitnik, The quantum adjacency algebra and subconstituent algebra of a graph,J. Comb. Theory, Ser. A 166 (2019) 297–314.