A. M. Herrera Navarro, H. Jiménez Hernández, H. Peregrina Barreto, F. Manríquez Guerrero, and I. R. Terol Villalobos, “Characterization of the roundness degree of graphite nodules in ductile iron: A new discrete measure independent to resolution”, Superficies y Vacio, vol. 26, no. 2, pp. 58-63, Jun. 2013.