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2. Pentacyclic triterpenes of the hopane type as ubiquitous geochemical markers: origin and significance;Ensminger,1974
3. Evolution of polycyclic alkanes under the effect of burial (Early Toarcian shales, Paris basin);Ensminger,1977
4. Steranes and terpanes in kerogen pyrolysis for correlation of oils and source rocks;Seifert;Geochim Cosmochim Acta,1978
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