, H.T.H.M. 2015. Mixed Integer Programming Model for open Vehicle Routing Problem with Fleet and driver Scheduling Considering Delivery and Pick-Up Simultaneously. International Journal on Recent and Innovation Trends in Computing and Communication. 3, 9 (Sep. 2015), 5508–5513. DOI:https://doi.org/10.17762/ijritcc.v3i9.4871.