The number of square islands on a rectangular sea
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Tài liệu tham khảo
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E. K. Horváth, Z. Németh, G. Pluhár, The number of triangular islands on a triangular grid, Periodica Math. Hungar., 58 (2009), 25–34.
ZS. Lengvárszky, The minimum cardinality of maximal systems of rectangular islands, Europ. J. Combinatorics, 30 (2009), 216–219.
G. Pluhár, The number of brick islands by means of distributive lattices, Acta Sci. Math. (Szeged), 75 (2009), 3–11.