A. Antuzevics, U. Rogulis, A. Fedotovs, and A.I. Popov, Crystalline phase detection in glass ceramics by EPR spectroscopy, Low Temp. Phys. 44, (2018) [Fiz. Nizk. Temp. 44, 449-454, (2018)] DOI: https://doi.org/10.1063/1.5030462.