@article{oai:nagoya.repo.nii.ac.jp:00031298,
 author = {Uchida, Shigeo and Watanabe, Kyoshi and Takada, Haruhiko},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Mar},
 note = {The expansion of gas molecules into vacuum ejected in a finite period is investigated on the basis of the collisionless Boltzmann equation. It is shown that the cloud of molecules diffuses into space advancing with mass velocity and that the distribution of density is fairly deformed by individual mass velocity.},
 pages = {80--87},
 title = {Collisionless expansion of gases of finite amount into vacuum},
 volume = {16},
 year = {1965}
}