9Ferrari A C and Robertson J. 2000.Interpretation of Raman spectra of disordered and amorphous carbon [J]. Physical review B, 61:14095-14107.
10Jehlicka J and Edwards H G M. 2008. Raman spectroscopy as a tool for the non-destructive identification of organic minerals in the geological record [J]. Organic Geochemistry, 39: 371-386.