クリーク (グラフ理論)
↑ Gross, J. L.; Yellen, J.; Zhang, P. (2014). Handbook of Graph Theory (2nd ed.). CRC Press. p. xiv. ISBN 978-1-4398-8019-7. https://books.google.com/books?id=cntcAgAAQBAJ
↑ Godsil, Chris; Gordon Royle (2004) [1949]. Algebraic graph theory. New York: Springer. ISBN 0-387-95220-9 , p.3