@techreport{oai:tsukuba.repo.nii.ac.jp:00022653,
 author = {Ohbo, K. and Tsurutani, M. and Umezawa, M. and Yamamoto, Y},
 month = {},
 note = {Includes bibliographical references},
 title = {Social welfare function for restricted reference domain},
 year = {2004}
}