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Ismail A. B., . and Umi Kalsom M. S., . and Mohd Hanif M. J., . (2005) Extraction and characterization of humic acids from peat soil under various landuse types. [Proceedings Paper]
Janice A., . and Emmy Aida K., . and Sahilah A. M., . and Umi Kalsom M. S., . and Norfadilah A. H., . (2004) Elemental and spectroscopic characterization of humic acid extracted from solid fermentation of selected agro-wastes. [Proceedings Paper]
Umi Kalsom M. S., . and Emmy A. K., . and Sashikala M. P., . and Norlea A., . (2003) Potential of trichoderma viride in degradation of lignocellulose for humic acid production. [Proceedings Paper]