1. The vehicle routing problem: State of the art classification and review;Braekers;Computers & Industrial Engineering,2016
2. A tabu search algorithm for the multi-trip vehicle routing and scheduling problem;Brandão;European Journal of Operational Research,1997
3. A memetic algorithm for the multi trip vehicle routing problem;Cattaruzza;European Journal of Operational Research,2014
4. The truck dispatching problem;Dantzig;Management Science,1959
5. De Backer, B., Furnon, V., Kilby, P., Prosser, P., & Shaw, P. (1997). Local search in constraint programming: Application to the vehicle routing problem. Retrieved from https://pdfs.semanticscholar.org/2666/03a503d1dbb84bb1f570c133745e8b9dc8f0.pdf.