S. S.Govindaraj, J. Dhalia Sweetlin, A. Vignesh, J. Daphy Louis Lovenia, C. Roshini, and P. Horsley Solomon, “Metro bus transit frequency regulation system for a smart city using an optimization algorithm”, IJET, vol. 7, no. 4, pp. 6523–6527, Jun. 2019, doi: 10.14419/ijet.v7i4.28118.