Cifuentes Rojas, W. A., Echeverry Ibarra, D. F. and Vásquez Palacios, H. (1) “Implementation of pulse-density modulation PDM in an ozone generation system and its contribution to the characteristic efficiency curve”, Revista Ingenierías Universidad de Medellín, 13(25), pp. 137-149. doi: 10.22395/rium.v13n25a9.