Villacrés-Parra, S. R., Viscaíno-Cuzco, M. A. and Gallegos-Londoño, C. M. (2021) “Preventive maintenance optimization methodologies focused on power transformers: A state of the art review”, ConcienciaDigital, 4(3.1), pp. 238-252. doi: 10.33262/concienciadigital.v4i3.1.1827.