@techreport{oai:nifs-repository.repo.nii.ac.jp:00010367,
 author = {"Urata,  K. and Hatori,  T. and Amano,  T."},
 month = {Feb},
 note = {The current bubble means a helical duct with low current density invading the inner high current region of current carrying toroidal plasmas. It is a non-turbulent analogue of the MHD clump. The numerical simulations show that it appears right after the absorption of a small magnetic island into the chaotic layer in the separatrix region of a large magnetic island.},
 title = {Current Bubble Formation by Nonlinear Coupling of Resisitive Tearing Modes},
 year = {1990}
}