Parvinder Singh Sandhu and  Gurdev Singh,  Dynamic Metrics for Polymorphism in Object Oriented Systems.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2008, vol. 15(3). 697 - 700
    [viewed 09 May 2021]. Available from: https://publications.waset.org/pdf/15427.