Application of the Method of Analysis of Hierarchies in Solving the Problem of Diversification of the Composition of the Portfolio of Electricity Generation Publication Type: Journal Article Authors: Volodymyr Zaslavskyi; Kateryna Krasovska; Maya Pasichna Source: Visnyk Kyivskoho universytetu, Seriia: Fizyko-matematychni nauky, Volume 2, p.123-131 (2017)