Brailovskii, V.V., Rozhdestvenskaya, M.G., Pislar, I.V. and Poshak, O.V. 2015. Physiologic aspects of designing hidden information systems based on visible optical radiation. Technology and design in electronic equipment. 1 (Feb. 2015), 13-16. DOI:https://doi.org/10.15222/TKEA2015.1.13.