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

Available for University of the Philippines Diliman via SpringerLink. Click here to access
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Intuitionistic fuzzy calculus per 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