A dynamic algorithm for topologically sorting directed acyclic graphs
David J. Pearce
and Paul H. J. Kelly
Proc. 3rd Int. Worksh. Efficient and Experimental Algorithms (WEA 2004), Lecture Notes in Computer Science, Springer-Verlag, 2004
http://www.doc.ic.ac.uk/~phjk/Publications/DynTopoSortWEA2004.pdf
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