М. А. Назаркевич, І. М. Дронюк, О. А. Троян, and Т. Ю. Томащук, “THE DEVELOPMENT METHODS OF THE SECURITY DOCUMENT WHAT ARE BASED ON LATENT ELEMENTS WITH FRACTALS”, Zahist ìnf., vol. 17, no. 1, pp. 21–26, May 2015.