@techreport{oai:tsukuba.repo.nii.ac.jp:00022699,
 author = {Yamada, Tadashi and 山田, 直志 and Yamada, Tetsuji and 山田, 哲司 and Zeng, Weihong and Chen, Chia-Ching},
 month = {},
 note = {Access: via WWW},
 title = {Why is employee's overwork prevalent in Japan, despite the adverse effects on health?},
 year = {2005}
}