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@article{JAC_1999__10_1_a5, author = {Brouwer, A.E. and Koolen, J.H.}, title = {The distance-regular graphs of valency four}, journal = {Journal of Algebraic Combinatorics}, pages = {5--24}, publisher = {mathdoc}, volume = {10}, number = {1}, year = {1999}, language = {en}, url = {http://geodesic.mathdoc.fr/item/JAC_1999__10_1_a5/} }
Brouwer, A.E.; Koolen, J.H. The distance-regular graphs of valency four. Journal of Algebraic Combinatorics, Tome 10 (1999) no. 1, pp. 5-24. http://geodesic.mathdoc.fr/item/JAC_1999__10_1_a5/