1. Elemental analysis of isolated fulvic acids from different origin;Abbt-Braun;Vom Wasser,1990
2. Adsorption behaviour of humic substances on activated carbon: Comparison with the physical and chemical character of material from different origin;Abbt-Braun;Environ. Int.,1994
3. Humic substances in soil, sediment and water. Geochemistry, isolation, and characterization,1985
4. Heavy metal interaction with aquatic humus;Frimmel;Int. J. Environ. Anal. Chem.,1983
5. Titration of aquatic humic substances and their calcium complexes with strong acids and bases;Frimmel;Z. Wasser-Abwasser Forsch.,1985