Geodesic
Factoring directed graphs with respect to the cardinal product in polynomial time II
Discussiones Mathematicae. Graph Theory, Tome 30 (2010) no. 3, pp. 461-474

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By a result of McKenzie [7] all finite directed graphs that satisfy certain connectivity conditions have unique prime factorizations with respect to the cardinal product. McKenzie does not provide an algorithm, and even up to now no polynomial algorithm that factors all graphs satisfying McKenzie's conditions is known. Only partial results [1,3,5] have been published, all of which depend on certain thinness conditions of the graphs to be factored.
Keywords: directed graphs, cardinal product, graph algorithms 
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     title = {Factoring directed graphs with respect to the cardinal product in polynomial time {II}},
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Imrich, Wilfried; Klöckl, Werner. Factoring directed graphs with respect to the cardinal product in polynomial time II. Discussiones Mathematicae. Graph Theory, Tome 30 (2010) no. 3, pp. 461-474. http://geodesic.mathdoc.fr/item/DMGT_2010_30_3_a8/