T. Sungkaworn and  W. Triampo and  P. Nalakarn and  D. Triampo and  I. M. Tang and  Y. Lenbury and  P. Picha,  The Effects of TiO2 Nanoparticles on Tumor Cell Colonies: Fractal Dimension and Morphological Properties.   journal   = {International Journal of Medical and Health Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2008, vol. 13(1). 20 - 27
    [viewed 03 April 2020]. Available from: https://publications.waset.org/pdf/11854.