1. Uptake of amino acids by kerogen;Abelson;Carnegie Inst. Washington Yearb.,1970
2. Reactions of amino acids with natural and artificial humus and kerogens;Abelson;Carnegie Inst. Washington Yearb.,1971
3. Organic acids obtained by alkaline permanganate oxidation of kerogen from the Green River (Colorado) shale;Djuricic;Geochim. Cosmochim. Acta,1971
4. A comparison of melanoidin and humic acid;Hoering;Carnegie Inst. Washington Yearb.,1973
5. Organic geochemistry of a lacustrine sediment (Lake Haruna, Japan);Ishiwatari;Chem. Geol.,1980