Positively and negatively charged magneto excitons in GaAs/Ga1-xAlxAs double quantum wellsN. Angayarkanni, C. K. Yoo and A. John PeterEur. Phys. J. B, 78 4 (2010) 489-496DOI: https://doi.org/10.1140/epjb/e2010-10693-7