1. Bioaccumulation of some hazardous metals by sol–gel entrapped microorganisms;Al-Saraj;Journal of Non-Crystalline Solids,1999
2. Chojnacka, K., 2003. Heavy metal ions removal by microalgae Spirulina sp. in the processes of biosorption and bioaccumulation. PhD Dissertation, Wroclaw University of Technology, Poland.
3. Cadmium uptake by Spirulina maxima: toxicity and mechanism;Costa;World Journal of Microbiology & Biotechnology,1998
4. Directive of Polish Ministry of the Environment: Dz. U. 9111.6503 (from 5.11.1991).
5. Directive of Polish Ministry of the Environment: Dz. U. 0111.51229 (from 18.07.2001).