D.J. Brink and  N.G. van der Berg and  L.C. Prinsloo and  A. Botha,  Broad-Band Chiral Reflectors based on Nano-Structured Biological Materials.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2009, vol. 33(9). 603 - 607
    [viewed 16 October 2021]. Available from: https://publications.waset.org/pdf/4809.