Name sifeng Liu Affiliation پژوهشگر خارجی Degree Website Email — JournalPaper Presentation FinishedProject Book ConferenceHoldings Speech Panel WorkShop TheorizingChair ResearchExcellence Innovation Publication ExecutiveActivity Thesis Sabbatical GrantAttraction Contribution IndustryVisit Art TitleJournal 1 A Hybrid Grey Decision Methodology in Social Sustainable Supplier Selection Sustainability 2 A new approach in animal diet using grey system theory Grey Systems: Theory and Application