Gupta, S. P., D. P. Khanal, U. Pyakurel, and T. N. Dhamala. “Approximate Algorithms for Continuous-Time Quickest Multi-Commodity Contraflow Problem”. The Nepali Mathematical Sciences Report, vol. 37, no. 1-2, Dec. 2020, pp. 30-46, doi:10.3126/nmsr.v37i1-2.34068.