1. Chemical Characteristics of Fulvic Acids
2. Gross chemical fractionation of organic matter;Black,1965
3. Humic acid fractionation using a nearly linear pH gradient;Curtis;Anal. Chem.,1981
4. Water chemistry effect in the flotation of sulfide ores — a review and discussion for molybdenite;Hoover;Trans. Inst. Min. Metall.,1980
5. Physic of Semiconductors;Ioffe,1957