Salazar-Hornig, Eduardo Javier, and Gina Andrea Soto Gavilán. “Makespan Minimization on Unrelated Parallel Machines Scheduling Problem With Sequence Dependent Setup Times by a VNS ACO Hybrid Algorithm”. Revista Ingenierías Universidad De Medellín, vol. 20, no. 38, Apr. 2021, pp. 171-84, doi:10.22395/rium.v20n38a11.