@article{oai:nipr.repo.nii.ac.jp:00006290,
 author = {Saito,Yoshitaka and Yamagami,Takamasa and Nishimura,Jun},
 journal = {Advances in polar upper atmosphere research},
 month = {Sep},
 note = {P(論文), For long duration balloon flights, when the balloon is outside the tele-command range, it is necessary to control the altitude automatically since the temperature of the lifting gas decreases at sunset. Here, we propose a new method referring to the inner pressure at the nadir of a balloon. The inner pressure is approximately proportional to the amount of descent from the level altitude and to the atmospheric pressure at the level altitude. This method has advantages in its simplic- ity and does not require prior information of the level altitude.},
 pages = {182--190},
 title = {Automatic ballast control referring to the inner pressure at the nadir of the balloon},
 volume = {13},
 year = {1999}
}