1. The abundance of 3He in atmospheric and well helium;Aldrich;Phys. Rev.,1946
2. The occurrence of 3He in natural sources of helium;Aldrich;Phys. Rev.,1948
3. Isotopic variations in terrestrial xenon;Butler;J. Geophys. Res.,1963
4. Biogenic and thermogenic origins of natural gas in Cook Inlet Basin, Alaska;Claypool;Am. Assoc. Pet. Geol. Bull.,1980
5. Organic sedimentation and genesis of petroleum in Mahakam Delta, Borneo;Combaz;Am. Assoc. Pet. Geol. Bull.,1978