Shapovalov, Yurij     Frequency symbolic models of linear parametric circuits [Текст] / Yurij Shapovalov, Bohdan Mandziy, Dariya Smal, Janusz Lipinski // Computational problems of electrical engineering (CPEE'2011) : proc. of the 12th Intern. symp., Sept. 5-7, 2011, Kostryno, Ukraine / Lviv Polytechnic Nat. Univ., Warsaw. Univ. of Technology, Techn. Univ. of Lodz, Univ. of West Bohemia. — Lviv : Lviv Polytechnic Nat. Univ., 2011. — P. 29.