@article{oai:ipsj.ixsq.nii.ac.jp:00003311,
 author = {内平, 直志 and 平石, 邦彦 and 青山, 幹雄 and Uchihira, Naoshi and Hiraishi, Kunihiko and Aoyama, Mikio},
 issue = {1},
 journal = {情報処理},
 month = {Jan},
 title = {ペトリネットは便利な道具},
 volume = {39},
 year = {1998}
}