ラマヌジャングラフ
↑ Murty.
↑ Lubotzky, Phillips & Sarnak (1988).
↑ Moshe Morgenstern (1994). “Existence and Explicit Constructions of q+1 Regular Ramanujan Graphs for Every Prime Power q”. Journal of Combinatorial Theory, Series B 62: 44–62. doi:10.1006/jctb.1994.1054.