Сопілко, І. М., and О. В. Пономаренко. “Technological Measures of Copyright Protection: Using Problems”. Scientific works of Kyiv Aviation Institute. Series Law Journal "Air and Space Law" 4, no. 25 (December 25, 2012): 85–88. Accessed June 14, 2026. http://jrnl.kai.edu.ua/index.php/UV/article/view/5863.