Shapovalov, Yuriy     The peculiarities of analysis of linear parametric circuit performed by frequency-symbolic method [Текст] / Yuriy Shapovalov, Bohdan Mandziy, Spartak Mankowsky // Computational problems of electrical engineering : abstr. of X Intern. workshop, Waplewo, Poland, Sept. 16-19, 2009. — Warsaw, 2009. — P. 20.