5BS2000: Part 346:1996 Determination of polycyclic aromatics in unused lubricating base oils and asphaltene flee petroleum fraetions-Dimethyl sulphoixide extraction refractive index method
6ASrM 132269:1993 Standard Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
7Fusheng Sun, David Littlejohn, Mark David Gibson. Analytica Chimica Acta, 1998, 364:1
8Appendix A to Part 136 Methods for organic chemical analysis of municipal and industrial wastewater Method 610-Polynuclear aromatic hydrocarbons
9Y F Song, X Jing, S Fleischmann et al. Chemosphere,2002, 48:993
10Steven B Hawthorne, Carol B Grabanski, Esther Martin et al. J Chrornatogr A, 2002, 892:421