Tarasankar Pramanik and  Sukumar Mondal and  Madhumangal Pal,  The Diameter of an Interval Graph is Twice of its Radius.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2011, vol. 56(8). 1412 - 1417
    [viewed 14 May 2021]. Available from: https://publications.waset.org/pdf/3440.