[2] Burke E A J. Lithos, 2001, 55(1－4): 139.
[3] Frezzotti M L, Tecce F, Casagli A. Journal of Geochemical Exploration, 2012, 112: 1.
[13] Jehlicka J, Edwards H G. Organic Geochemistry, 2008, 39: 371.
[14] Bruno J Z, Wilhoit R C, Dickson C H, et al. Selected Raman Spectral Data. Supplementary Vol. No. D-23 of the TRC-API44 Hydrocarbon Project Publication, 1978.
[15] Loppnow G R, Shoute L, Schmidt K J, et al. The Royal Society, 2004, 362: 2461.
