N. N. Loshkareva, E. V. Mostovschikova, N. I. Solin, S. V. Naumov, N. V. Kostromitina, A. M. Burkhanov, “Crossover from polaron to band conduction upon doping CaMnO$_3$ with La ions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 86:6 (2007), 432–435; JETP Letters, 86:6 (2007), 375–378
