WASET
    J. Kavikumar and  N. S. Manian and  M.B.K. Moorthy,  Best Co-approximation and Best Simultaneous Co-approximation in Fuzzy Normed Spaces.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2014, vol. 85(1). 211 - 217
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/9997819.