1. A Imran, S Salhi, NA Wassan, 2009. A variable neighborhood-based heuristic for the heterogeneous fleet vehicle routing problem, European Journal of Operational Research 197 (2), 509-518.
2. S Salhi, A Imran, NA Wassan, 2014. The multi-depot vehicle routing problem with heterogeneous vehicle fleet: Formulation and a variable neighborhood search implementation, Computers & Operations Research 52, 315-325.
3. A Imran, M Luis, L Okdinawati, 2016. A variable neighborhood search for the heterogeneous fixed fleet vehicle routing problem, Jurnal Teknologi 78 (9).
4. CA Irawan, A Imran, M Luis, 2020. Solving the biâ€objective capacitated pâ€median problem with multilevel capacities using compromise programming and VNS, International Transactions in Operational Research 27 (1), 361-380.
5. CA Irawan, M Luis, S Salhi, A Imran, 2019. The incorporation of fixed cost and multilevel capacities into the discrete and continuous single source capacitated facility location problem, Annals of Operations Research 275 (2), 367-392.