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References:
[1] P. HELL: Sub-direct product of bipartite graphs. Coll. Math. Soc. János Bolyai, 10. Infinite and finite sets, Keszthély, 1973, 857-866. MR 0371739
[2] D. J. MILLER: The categorical product of graphs. Canad. J. Math. 20 (1968), 1511-1521. MR 0231745 | Zbl 0167.21902
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