Chirinos, José R, Dayana D Oropeza, Jhanis J Gonzalez, María Ranaudo, and Richard E Russo. "Determination of Vanadium/Nickel Proportionality in the Asphaltene Fraction of Crude Oil Using Thin-Layer Chromatography with Femtosecond Laser Ablation–Inductively Coupled Plasma–Mass Spectrometry." Energy & Fuels 27.5 (2013) 2431–2436. DOI | Google Scholar | BibTeX | Endnote tagged