@article{oai:ipsj.ixsq.nii.ac.jp:00063338,
 author = {前川, 徹 and Maegawa, Toru},
 issue = {12},
 journal = {情報処理},
 month = {Dec},
 title = {情報セキュリティ歳時記:不正アクセスの実態と対策(その4)},
 volume = {40},
 year = {1999}
}