@article{oai:nipr.repo.nii.ac.jp:00002234,
 author = {Uchida, Tsutomu and Duval, Paul and Lipenkov, Volodya Ya. and Hondoh, Takeo and Mae, Shinji and Shoji, Hitoshi},
 journal = {Memoirs of National Institute of Polar Research. Special issue},
 month = {Mar},
 note = {P(論文), Microscopic observations of air bubbles and air-hydrate crystals included in the Vostok ice cores, Antarctica, revealed that badly fractured ices were observed in the ice cores having high concentration of air bubbles. They also showed that the transformation of air bubbles to air-hydrate crystals reduced the chance of ice core fracture. In this paper, we suggest a fracture model of an ice core including air bubbles to discuss the depth dependence of ice core brittleness.},
 pages = {298--305},
 title = {Brittle zone and air-hydrate formation in polar ice sheets},
 volume = {49},
 year = {1994}
}