Moreno-Mendoza, J. F., Santa-Marín J. F., R. Buitrago-Sierra, and K. Cacua. “Experimental Study of the Stability and Thermophysical Properties of PEG400 With CuO and G As a Biodegradable Nanolubricant”. Fuentes, El reventón energético, vol. 19, no. 1, June 2021, pp. 75-84, doi:10.18273/revfue.v19n1-2021007.