Hugo Duminil-Copin, Stanislav Smirnov. The connective constant of the honeycomb lattice equals // Annals of Mathematics. — 2012. — Vol. 175, no. 3. — P. 1653—1665. — arXiv:1007.0575. — doi:10.4007/annals.2012.175.3.14.MR: 2912714.
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Hugo Duminil-Copin, Stanislav Smirnov. The connective constant of the honeycomb lattice equals // Annals of Mathematics. — 2012. — Vol. 175, no. 3. — P. 1653—1665. — arXiv:1007.0575. — doi:10.4007/annals.2012.175.3.14.MR: 2912714.
Hugo Duminil-Copin, Stanislav Smirnov. The connective constant of the honeycomb lattice equals // Annals of Mathematics. — 2012. — Vol. 175, no. 3. — P. 1653—1665. — arXiv:1007.0575. — doi:10.4007/annals.2012.175.3.14.MR: 2912714.