[1] (1〕Aquino, F.R.et al.,1983,Occurrence and formation of tricyclic and ttetracyc- lic terpanes in sediments and petroleum. in Advances in Organic Geochemistry, 1981,John Yilev and Sons Limited.

(2〕Bjoroy,b1.et al.,1983,An oil/oil correlation study- utilizing high resolution GC-MS. in advances in Organic Geochemistry 1981, John Wiley and Sons Limited.

(3〕Schmitter, J.M.et al.,1982, G eochim.Cosmochim.Acta, V.46,N.10, p.2345-2354.

(4〕Seifert, ZY.K.et al.,1978 Nature.Y.271,P.436-437.

(5〕Trendel,J.M,et al.,1982J .Chem.Soc. Chem .Commun.,V.1,N.S,P .304-305.