Jehad Al Dallal and  Paul Sorenson,  Generating Class-Based Test Cases for Interface Classes of Object-Oriented Gray-Box Frameworks.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2008, vol. 17(5). 1505 - 1513
    [viewed 27 February 2020]. Available from: https://publications.waset.org/pdf/14414.