Matviychuk, Yaroslav     Creating electronic device macromodels by quadratic and Chebyshev approximation [Текст] / Yaroslav Matviychuk, Peter Malachivsky, Roman Hasko // Computational problems of electrical engineeringVol. 2. Vol. 2. N. 1 ; Lviv Polytechnic Nat. Univ. ; ed.-in-chief Yuriy Bobalo - Lviv : Lviv Polytechnic nat. univ. , 2012. — P. 85-87.