Kochak, Bohdan     Application of particle swarm optimization method for solving the problems of approximation of electromechanical systems parts [Текст] / Bohdan Kochak // Computational problems of electrical engineering / Lviv Polytechnic nat. univ. ; ed.-in-chief Yuriy Bobalo. — Lviv : lviv Polytechnic nat. univ., 2012. — P. 41-44.