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T.N. Antsygina, M.I. Poltavskaya, I.I. Poltavsky, and K.A. Chishko, Heat capacity and spin susceptibility of two-dimensional t-J model: Related Topics, Low Temp. Phys. 33, (2007) [Fiz. Nizk. Temp. 33, 814-819, (2007)] DOI: https://doi.org/10.1063/1.2755210.