Navarro, Uriel, et al. “Separating and Characterising Resins and Asphaltenes from Castilla Crude Oils. Evaluating Their Molecular Interplay”. CT&F - Ciencia, Tecnología Y Futuro, vol. 2, no. 5, Dec. 2004, pp. 53-67, doi:10.29047/01225383.517.