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WikiPedia: Bài_toán_tám_quân_hậu http://www.durangobill.com/N_Queens.html http://mathworld.wolfram.com/QueensProblem.html http://kti.ms.mff.cuni.cz/~bartak/constraints/inde... http://firefang.net/english/n-queens http://www.liacs.nl/home/kosters/nqueens.html http://www.rodo.nl/nqueens_in_c++.pdf http://bridges.canterbury.ac.nz/features/eight.htm... https://web.archive.org/web/20061014001400/http://... https://web.archive.org/web/20070928103041/http://... https://web.archive.org/web/20071006032830/http://...