Two simplified proofs for Roberts' theorem

Ron Lavi, Ahuva Mu'alem, Noam Nisan. Two simplified proofs for Roberts' theorem. Social Choice and Welfare, 32(3):407-423, 2009. [doi]

@article{LaviMN09,
  title = {Two simplified proofs for Roberts' theorem},
  author = {Ron Lavi and Ahuva Mu'alem and Noam Nisan},
  year = {2009},
  doi = {10.1007/s00355-008-0331-y},
  url = {http://dx.doi.org/10.1007/s00355-008-0331-y},
  researchr = {https://researchr.org/publication/LaviMN09},
  cites = {0},
  citedby = {0},
  journal = {Social Choice and Welfare},
  volume = {32},
  number = {3},
  pages = {407-423},
}