Feher, A.; Desnenko, V.; Fertman, E.; Dolya, S.; Kajňaková, M.; Beznosov, A. Direct Evidence of the Low-Temperature Cluster-Glass Magnetic State of Nd_2/3Ca_1/3MnO₃ Perovskite: Магнетизм. Fiz. Nizk. Temp. 2012, 38, 828-832.