Ефимова, О. В., and Е. Л. Черкашина. “OPTICAL-ACOUSTIC FILTERS IN VIDEOSPECTROMETERS FOR EARTHLY SURFACE ECOLOGICAL CONTROL”. Lighting Engineering & Power Engineering, no. 2, Nov. 2013, pp. 35-39, https://lepe.kname.edu.ua/index.php/lepe/article/view/198.