Stasiuk, Ivan     he method of signal processing when measuring non-stationary values [Текст] / Ivan Stasiuk // Energy Engineering and Control SystemsVol. 1. Vol. 1. № 2 ; Lviv Polytechnic Nat. Univ. ; [ed.-in-chief Y. Pistun] - Lviv : Lviv Polytechnic Publishing House , 2015. — Р. 117–126.