Myronchuk Г., Davyduk Г., Parasiuk О., Shevchuk М., Jakymchuk О., and Danyl’chuk С., “Electrical and Optical Properties of AgGaGe2S2Se4 Single Crystals”, Ukr. J. Phys., vol. 57, no. 10, p. 1050, Dec. 2021.