M. V. Kuznetsov, I. P. Parkin, Y. G. Morozov, and A. G. Merzhanov, “Self-Propagating High-Temperature Synthesis of Chromium Substituted Lanthanide – Barium – Copper Oxides, LnBa2Cu3-xCrxO7-y (Ln = Y; La; Nd; Sm and Yb)”, Eurasian Chem.-Technol. J., vol. 4, no. 2, pp. 73–86, Mar. 2002.