1. Chakrabarti, J. N. (1978) Analytical procedures for sulfur in coal desulfurization products. Analytical Methods for Coal and Coal Products (Kar, C., Jr., ed.), 279-323, Academic Press.
2. Cram, W. J., De Kok, L. J., Stulen, I., Brunold, C. and Rennenberg, H. (1997) Sulfur Metabolism in Higher Plants. Backhuys Publishers, 155 pp.
3. Isotope ratios and concentrations of sulfur and nitrogen in needles and soils of Picea abies stands as influenced by atmospheric deposition of sulfur and nitrogen compounds
4. Giesemann, A., Schulz, H., Jung, K., Gehre, M., Schürmann, G. and Weigel, H.-J. (2000) Natural isotope variations of sulfur as an indication of atmospheric depositions on pine stands. Sulfur Nutrition and Sulfur Assimilation in Higher Plants (Brunold, C., Stulen, I., Rennenberg, H., Davidian, J.-C. and De Kok, L. J., eds.), 235-238, Paul Haupt Publishers.
5. Giesemann, A., Hofmann, F., Schlechtriemen, U. and Jung, K. (2005) An attempt to evaluate sulphur (S) and nitrogen (N) inputs into a forest ecosystem retrospectively by means of stable N and S isotope analysis in tree rings. Abhandlungen und Berichte des Naturkundemuseums Görlitz 76, 101-115.