@article{oai:jaxa.repo.nii.ac.jp:00023732,
 author = {平下, 博之 and 芝井, 広 and 竹内, 努 and Hirashita, H. and Shibai, H. and Takeuchi, T. T.},
 issue = {2},
 journal = {Astronomy & Astrophysics},
 month = {Jun},
 note = {Accepted: 2006-02-28, 資料番号: SA1000408000},
 pages = {481--485},
 title = {Search for high column density systems with gamma ray bursts},
 volume = {452},
 year = {2006}
}