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Baran, A.; Botko, M.; Zorkovská, A.; Kajňaková, M.; Šebek, J.; Šantavá, E.; Peng, J.; Lin, C.; Feher, A. Heat Capacity Studies of Magnetic Phase Transition in Sodium-Rich NaxCoO2 (0.73 ≤ x ≤ 0.87). Fiz. Nizk. Temp. 2009, 35, 1030-1033.