[1]
R. C. Ghosh, R. M. Singhal, and T. C. Pathak, “Comparative Determination of the Spectral Properties and Colloidal Behaviour of Humic Acids of Sal Forest Soils of Doon Valley Planted with <I>Eucalyptus</I>”;, Indian Forester, vol. 103, no. 11, pp. 701–707, Nov. 1977.