Brouwer, A. E. "On the Uniqueness of a Regular Thin Near Octagon on 2888 Vertices (or the Semibiplane belonging to the Mathieu Group ." 数学中心报告 ZW196. Amsterdam, Netherlands, Jul. 1983.Brouwer, A. E.; Cohen, A. M.; and Neumaier, A. "The Leonard Graph- over ." §11.4F in 距离正则图。 New York: Springer-Verlag, p. 371, 1989.DistanceRegular.org. "Halved Leonard Graphs (2 Graphs)." http://www.distanceregular.org/graphs/halved-leonard.html.DistanceRegular.org. "Leonard Graph." http://www.distanceregular.org/graphs/leonard.html.Leonard, D. A. 博士论文. Ohio State University, 1979.