1. D. M. N. M. Dissanayake, R. A. Hatton, T. Lutz, C. E. Giusca, R. J. Curry, and S. R. P. Silva, Appl. Phys. Lett., 91, 506–510 (2007).
2. G. Springholz, T. Schwarzl, W. Heiss, G. Bauer, M. Aigle, H. Pascher, and I. Vavra, Appl. Phys. Lett., 79, 1225–1229 (2001).
3. Z. H. Dughaish, Physica B, 322, 205–223 (2002).
4. D. M. Freik, G. Ye. Malashkevich, M. A. Lopyanko, V. V. Bachyk, and R. I. Nukuruy, Phys. Chem. Solid State, 12, 76–78 (2011).
5. Yu. N. Ravich, B. A. Efimova, and I. A. Smirnov, Methods for Study of Semiconductors Applied to the Lead Chalcogenides PbTe, PbSe, and PbS [in Russian], Nauka, Moscow (1968).