Literatúra
UsingGraphvizas a Library(cgraph version)Emden R. GansnerAugust 21, 2014
Operations on binary relations, Peter C.Fishburn, Volume 21, Issue 1, 1978, Pages 7-22
Complements and transitive closures, R.L.GrahamD.E.KnuthT.S.Motzkin, Discrete Mathematics
Volume 2, Issue 1, March 1972, Pages 17-29