Kovalchuk, Anatoliy     Using quaternary fractal fractional--linear form in encryption - descryption images with elements of RSA algorithm [Текст] / Anatoliy Kovalchuk, Ivan Tsmots, Mariana Stupen // Computer science and information technologies CSIT 2012 : proc. of the VII Intern. sci. and techn. conf., Nov. 20-24, 2012, Lviv, Ukraine / Min. of Education, Science, Youth and Sports of Ukraine, Lviv Politechniс Nat. Univ. — Lviv : Publ. Lviv Politechniс, 2012. — P. 52-53.