Transport and recombination in organic light-emitting diodes studied by electrically detected magnetic resonanceC. F. O. Graeff, G. B. Silva, F. Nüesch and L. ZuppiroliEur. Phys. J. E, 18 1 (2005) 21-28DOI: https://doi.org/10.1140/epje/i2005-10026-6