@article{oai:repository.dl.itc.u-tokyo.ac.jp:00024399,
 author = {[著者名なし]},
 issue = {12},
 journal = {生産研究},
 month = {Dec},
 note = {application/pdf},
 pages = {505--506},
 title = {難問題一覧表},
 volume = {4},
 year = {1952}
}