Vijaya K. Srivastava and  Davide Spinello,  Efficiency of Robust Heuristic Gradient Based Enumerative and Tunneling Algorithms for Constrained Integer Programming Problems.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2017, vol. 125(5). 201 - 206
    [viewed 26 January 2021]. Available from: https://publications.waset.org/pdf/10007035.