@article{articledfa3590c,
title   = {Magnetic-field asymmetry of nonlinear transport in a small ring},
author = {Gusev, Guennadii Michailovich and Kvon, Z D and Olshanetsky, E B and Plotnikov, A Y},
year = {2009},
doi = {10.1209/0295-5075/88/47007},
journal   = {Europhysics Letters-EPL}
}