Bobalo, Yuriy     Estimation of functional usability of radio electronic circuits by applying the method of confidence ellipsoids [Текст] / Yuriy Bobalo, Petro Stakhiv, Svitlana Krepych // Computational problems of electrical engineering / Lviv Polytechnic nat. univ. ; ed.-in-chief Yuriy Bobalo. — Lviv : lviv Polytechnic nat. univ., 2012. — P. 1-6.