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Quantum spin-1⁄2 model on a square lattice, with exact columnar-dimer ground state. [Rakesh Kumar and Brijesh Kumar, Phys. Rev. B 77, 144413 (2008)] |
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Quantum spin-1⁄2 model on a square lattice, with exact columnar-dimer ground state. [Rakesh Kumar and Brijesh Kumar, Phys. Rev. B 77, 144413 (2008)] |