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H. Klym, A. Ingram, O. Shpotyuk, I. Hadzaman, V. Solntsev, O. Hotra, and A.I. Popov, Positron annihilation characterization of free volume in micro- and macro-modified Cu0.4Co0.4Ni0.4Mn1.8O4 ceramics, Low Temp. Phys. 42, (2016) [Fiz. Nizk. Temp. 42, 764-769, (2016)] DOI: https://doi.org/10.1063/1.4959021 .