@article{freire_freire_farias_peeters_2002,  title={Exciton trapping in a periodically modulated magnetic field},  volume={32},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332002000200016},  DOI={10.1590/S0103-97332002000200016},  number={2a},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Freire, J.A.K. and Freire, V.N. and Farias, G.A. and Peeters, F.M.},  year={2002},  month={Jun},  pages={310–313} }