M. Rajasimman and  K. Murugaiyan,  Sorption of Nickel by Hypnea Valentiae: Application of Response Surface Methodology.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2011, vol. 49(1). 7 - 12
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/15726.