@phdthesis{oai:tsukuba.repo.nii.ac.jp:00021018,
 author = {孫, 在東},
 month = {},
 note = {2005, Includes bibliographical references},
 school = {筑波大学, University of Tsukuba},
 title = {Customer selection problem with profit from a sideline},
 year = {2005}
}