G. Myronchuk, G. Davyduk, O. Parasiuk, M. Shevchuk, O. Jakymchuk, and S. Danyl’chuk, “Electrical and Optical Properties of AgGaGe2S2Se4 Single Crystals”, Ukr. J. Phys., vol. 57, no. 10, p. 1050, Dec. 2021.