H. A. Méndez-Pinzón, D. R. Pardo-Pardo, J. P. Cuéllar-Alvarado, J. C. Salcedo-Reyes, R. Vera, and B. A. Páez-Sierra, “Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating”, Universitas Scientiarum, vol. 15, no. 1, pp. 68–76, Jan. 2010.