@article{foundationalpropositionsofhesitantfuzzy,
  title = {Foundational theories of hesitant fuzzy sets and families of hesitant fuzzy sets},
  author = {Shizhan Lu and Zeshui Xu and Zhu Fu and Longsheng Cheng and Tongbin Yang},
  year = {2023},
  eprint = {2311.04256},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2311.04256v4},
}