【序号】：1【作者】：Daniel H Stuermer,
K.E Peters,
I.R Kaplan【题名】：Source indicators of humic substances and proto-kerogen. Stable isotope ratios, elemental compositions and electron spin resonance spectra
【期刊】：Geochimica et Cosmochimica Acta【年、卷、期、起止页码】：Volume 42, Issue 7, July 1978, Pages 989–997
【链接】：http://www.sciencedirect.com/science/article/pii/0016703778902880
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