Ashish Pathak and  M. G. Dastidar and  T. R. Sreekrishnan,  Bioleaching of Heavy Metals from Sewage Sludge Using Indigenous Iron-Oxidizing Microorganisms: Effect of Substrate Concentration and Total Solids.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2009, vol. 34(10). 326 - 331
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10160.