独立集合
↑ Godsil, Chris; Gordon Royle (2004) [1949]. Algebraic Graph Theory. New York: Springer. p. 3. ISBN 0-387-95220-9
↑ Füredi, Z. (1987). “The number of maximal independent sets in connected graphs”. Journal of Graph Theory 11 (4): 463–470. doi:10.1002/jgt.3190110403.