@article{oai:barrel.repo.nii.ac.jp:00005097,
 author = {西村, 友幸},
 issue = {2},
 journal = {日本経営システム学会誌},
 month = {Mar},
 pages = {49--55},
 title = {集合レベルの基本戦略},
 volume = {23},
 year = {2007}
}