On type-2 fuzzy sets and their t-norm operations

@article{Hu2014OnTF,
  title={On type-2 fuzzy sets and their t-norm operations},
  author={Bao Qing Hu and C. K. Kwong},
  journal={Inf. Sci.},
  year={2014},
  volume={255},
  pages={58-81}
}