Leaching studies of inorganic and organic compounds from fly ash, Ariese, F., Swart K., Morabito Roberto, Brunori Claudia, Balzamo S., Slobodnik J., Korenková E., Janoš P., Wildnerova M., Hlavay J., et al. , International Journal of Environmental Analytical Chemistry, Volume 82, Number 11-12, p.751-770, (2002)