Hesitant fuzzy methods for multiple criteria decision analysis por Zhang, Xiaolu, Xu, Zeshui

Available for University of the Philippines Diliman via SpringerLink. Click here to access
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Intuitionistic fuzzy calculus por Lei, Qian, Xu, Zeshui

Available for University of the Philippines System via SpringerLink. Click here to access
Also available remotely for University of the Philippines System via SpringerLink. Click here to access thru EZproxy