T. N. Vasil'chikova, T. G. Kuz'mova, A. A. Kamenev, A. R. Kaul, A. N. Vasiliev, “Spin states of cobalt and the thermodynamics of Sm$_{1-x}$Ca$_x$CoO$_{3-\delta}$ solid solutions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 97:1 (2013), 38–41; JETP Letters, 97:1 (2013), 34–37
