DETERMİNATİON OF THE FİNANCİAL PERFORMANCE USİNG TOPSIS METHOD: APPLİCATİON İN BIST ELECTRİC GAS AND STEAM COMPANİES. Third Sector Social Economic Review, v. 56, n. 4, p. 2321–2334, 25 Dec.2021.