Usman Safder⁺, Pouya Ifaei⁺, ChangKyoo Yoo^*, Multi-objective optimization and flexibility analysis of a cogeneration system using thermorisk and thermoeconomic analyses, Energy Conversion and Management (ISSN: 0196-8904, SCIE, IF=4.8, Top 5% journal – THERMODYNAMICS: Rank 2 journal,), Elsevier, 166, pp.602-636; ; DOI(http://dx.doi.org/10.1016/j.enconman.2018.04.030) ^+: equal first author (2018.6) (Ack:2017R1E1A1A03070713)​