Geodesic
Factoring directed graphs with respect to the cardinal product in polynomial time
Discussiones Mathematicae. Graph Theory, Tome 27 (2007) no. 3, pp. 593-601.

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By a result of McKenzie [4] finite directed graphs that satisfy certain connectivity and thinness conditions have the unique prime factorization property with respect to the cardinal product. We show that this property still holds under weaker connectivity and stronger thinness conditions. Furthermore, for such graphs the factorization can be determined in polynomial time.
Keywords: directed graphs, cardinal product, graph algorithms 
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Imrich, Wilfried; Klöckl, Werner. Factoring directed graphs with respect to the cardinal product in polynomial time. Discussiones Mathematicae. Graph Theory, Tome 27 (2007) no. 3, pp. 593-601. http://geodesic.mathdoc.fr/item/DMGT_2007_27_3_a16/

[1] J. Feigenbaum and A.A. Schäffer, Finding the prime factors of strong direct product graphs in polynomial time, Discrete Math. 109 (1992) 77-102, doi: 10.1016/0012-365X(92)90280-S.

[2] W. Imrich, Factoring cardinal product graphs in polynomial time, Discrete Math. 192 (1998) 119-144, doi: 10.1016/S0012-365X(98)00069-7.

[3] W. Imrich and S. Klavžar, Product Graphs, Wiley-Interscience Series in Discrete Mathematics and Optimization (Wiley-Interscience, New York, 2000), Structure and recognition, With a foreword by Peter Winkler.

[4] R. McKenzie, Cardinal multiplication of structures with a reflexive relation, Fund. Math. 70 (1971) 59-101.