@article{takahagi_2020, 
  title={On set-function representations of the n-grade evaluation values}, 
  volume={36}, 
  DOI={10.14864/fss.36.0_485}, 
  number={0}, 
  publisher={Japan Society for Fuzzy Theory and Intelligent Informatics}, 
  author={Takahagi, Eiichiro}, 
  year={2020}
  }