A. García-Pérez, J. A. Andrade-Lucio, O. G. Ibarra-Manzano, E. Alvarado-Méndez, M. Trejo-Duran, and H. Gutiérrez-Martín, “Efficient Modulation Formats for High Bit-Rate Fiber Transmission”, Acta Universitaria, vol. 16, no. 2, pp. 17–26, Aug. 2006, doi: 10.15174/au.2006.184.