N. V. Tkach, J. A. Seti, V. A. Matijek, I. V. Boiko, “On the active conductivity of a three-barrier resonant-tunneling structure and optimization of quantum cascade laser operation”, Fizika i Tekhnika Poluprovodnikov, 46:10 (2012), 1327–1332; Semiconductors, 46:10 (2012), 1304–1309
