1. The phenolic constituents of humic acid and their relation to the lignin of the plant cover;Burges;Geochim. Cosmochim. Acta,1964
2. The influence of an elevation-vegetation site factor on the humus formed in recent volcanic ash soils: 1. Humus fraction characteristics;Drijber;Geoderma,1991
3. Contribution of soil microbes to the formation of humic compounds;Haider,1975
4. Identification of phenolic acids, molecular weight determinations of fulvic acids and quantitative measurements of phenolic and fulvic acids by HPLC from forest and moss humus;Hanninen,1981
5. High-performance liquid chromatography of phenolic acids and aldehyes derived from plants or from the decomposition of organic matter of soil;Hartley;J. Chromatogr.,1979