@article{oai:nifs-repository.repo.nii.ac.jp:00001238,
 author = {"Yokoyama,  M. and Nakajima,  N. and Okamoto,  M. and Nakamura,  Y. and Wakatani,  M."},
 journal = {Annual Report of National Institute for Fusion Science},
 month = {2016-03-11},
 title = {Role of Bumpy Field for Improvement of Collisionless Particle Confinement in Helical Axis Heliotrons},
 volume = {Annual Report Apr.1996 - Mar.1997},
 year = {}
}