Z. Kovalyuk, V. . Netyaga, M. Pyrlya, R. Potsiluiko, and V. Boledzyuk, “The Effect of the Thermal Introduction of NaNO2 on the Optical Properties of Indium and Gallium Monoselenides”, Phys.Chem.Sol.State, vol. 17, no. 4, pp. 544–547, Dec. 2016.