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V.O. Cheranovskii, D.J. Klein, E.V. Ezerskaya, and V.V. Tokarev, Validity of t–J approximation for extended Hubbard model with strong repulsion, Low Temp. Phys. 43, (2017) [Fiz. Nizk. Temp. 43, 1622-1625, (2017)] DOI: https://doi.org/10.1063/1.5010315.