@techreport{oai:tsukuba.repo.nii.ac.jp:00035954,
 author = {CHANG, Yaxuan and YOSHINO, Kunihiko and 吉野, 邦彦},
 month = {Oct},
 title = {Willingness to Sell (WTS): An Incorporative Market Research of Contrastive Testing on WTP, WTS and WTA},
 year = {2015}
}