@techreport{oai:tsukuba.repo.nii.ac.jp:00022865,
 author = {Kabasawa, Takeru and Murata, Kentaro and Shigeno, Maiko},
 month = {Mar},
 title = {A Note on FPTAS for Single Machine Weighted Tardiness Problem with a Common Due Date},
 year = {2008}
}