Poveda, J. C., D. R. Molina, and E. F. Pantoja Agreda. “1H- and 13C-NMR Structural Characterization of Asphaltenes from Vacuum Residua Modified by Thermal Cracking”. CT&F - Ciencia, Tecnología Y Futuro, Vol. 5, no. 4, June 2014, pp. 49-60, doi:10.29047/01225383.40.