@article{oai:kitami-it.repo.nii.ac.jp:00007018,
 author = {P., Pichayapan and K., Kishi and K., Sato and K., Takahashi},
 month = {Jan},
 pages = {576--577},
 title = {Value of Defer Option in Otaru-Yoichi Expressway Project},
 volume = {59},
 year = {2003}
}