@techreport{oai:tsukuba.repo.nii.ac.jp:00022794,
 author = {Tsurutani, Masafumi and Umezawa, Masashi and Yamamoto, Yoshitsugu and 山本, 芳嗣},
 month = {Jul},
 title = {Impossibility and possibility theorems of social choice function with restricted alternative set},
 year = {2005}
}