[6] Qin Z, Xianming X, Lei P, et al. International Journal of Coal Geology, 2014, 121: 19.
[7] Jehlika J, Beny C. Journal of Molecular Structure, 1999, 480-481: 541.
[8] Jehlika J, Urban O, Pokorny J. Spectrochimica Acta Part A, 2003, 59: 2341.
[9] Court R W, Sephton M A, Parnell J, et al. Geochimica et Cosmochimica Acta, 2007, 71: 2547.
[11] 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.
[14] Mango F D. Geochimica et Cosmochimica Acta, 2000, 64(7): 1265.