Nilesh N. Karnik, Jerry M. Mendel. Operations on type-2 fuzzy sets. Fuzzy Sets and Systems, 122(2):327-348, 2001. [doi]
@article{KarnikM01,
title = {Operations on type-2 fuzzy sets},
author = {Nilesh N. Karnik and Jerry M. Mendel},
year = {2001},
doi = {10.1016/S0165-0114(00)00079-8},
url = {http://dx.doi.org/10.1016/S0165-0114(00)00079-8},
researchr = {https://researchr.org/publication/KarnikM01},
cites = {0},
citedby = {0},
journal = {Fuzzy Sets and Systems},
volume = {122},
number = {2},
pages = {327-348},
}