Medina Villadiego, M., Ospino Roa, Y. and Tejeda Benítez, L. 2015. Esterification and transesterification of waste oils for biodiesel obtaining. Luna Azul. 40 (Jan. 2015), 25–34. DOI:https://doi.org/10.17151/10.17151/luaz.2015.40.3.