On the structure of DFS-forests on directed graphs and the dynamic maintenance of DFS on DAG's
Paolo G. Franciosa,
Giorgio Gambosi,
and Umberto Nanni
Proc. 2nd Eur. Symp. Algorithms (ESA 1994), Lecture Notes in Computer Science 855, Jan van Leeuwen, ed., Springer-Verlag, Sep 1994, pp. 343–353
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