Ackora Prah, J., V. Acheson, B. Barnes, I. Takyi, and E. Owusu-Ansah. “A 2-Phase Method for Solving Transportation Problems With Prohibited Routes”. Pakistan Journal of Statistics and Operation Research, Vol. 18, no. 3, Sept. 2022, pp. 749-58, doi:10.18187/pjsor.v18i3.3911.