@article{article7f19a704,
title   = {Chaotic magnetic field lines in tokamaks with ergodic limiers},
author = {Portela, Jefferson S E and Viana, Ricardo L and Caldas, Iberê Luiz},
year = {2003},
doi = {10.1016/s0378-4371(02)01351-1},
journal   = {Physica A}
}