Ai, T. J., and E. M. Mahulae. “Applying Particle Swarm Optimization for Solving Team Orienteering Problem With Time Windows”. Jurnal Teknik Industri: Jurnal Keilmuan Dan Aplikasi Teknik Industri, vol. 16, no. 1, May 2014, pp. 9-16, doi:10.9744/jti.16.1.9-16.