Brailovskii, V. V., M. G. Rozhdestvenskaya, I. V. Pislar, and O. V. Poshak. “Physiologic Aspects of Designing Hidden Information Systems Based on Visible Optical Radiation”. Technology and design in electronic equipment, no. 1 (February 24, 2015): 13-16. Accessed September 16, 2025. http://www.tkea.com.ua/index.php/journal/article/view/TKEA2015.1.13.