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D.V. Fil and S.I. Shevchenko, Bose-Einstein condensation in a decorated lattice: an application to the problem of supersolid He: Твердый гелий, Low Temp. Phys. 34, (2008) [Fiz. Nizk. Temp. 34, 440-446, (2008)] DOI: https://doi.org/10.1063/1.2911654.