@article{oai:tsukuba.repo.nii.ac.jp:00007524,
 author = {Hirai, H. and 平井, 寿子 and Tanaka, T. and Kawamura, T. and Yamamoto, Y. and Yagi, T.},
 issue = {17},
 journal = {Physical review B},
 month = {Nov},
 title = {Retention of filled ice structure of methane hydrate up to 42 GPa},
 volume = {68},
 year = {2003}
}