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G.E. Grechnev, P. Scharff, U. Ritter, M.I. Grybova, Yu.I. Prylutskyy, L.Yu. Matzui, A.S. Panfilov, A.V. Fedorchenko, V.A. Desnenko, and Yu.A. Kolesnichenko, Structure and magnetic properties of multi-walled carbon nanotubes modified with iron, Low Temp. Phys. 36, (2010) [Fiz. Nizk. Temp. 36, 1347-1351, (2010)] DOI: https://doi.org/10.1063/1.3530422.