1. Adams E., 2016. DHL's Tilt-Rotor ‘Parcelcopter’ is both awesome and actually useful. WIRED. Retrieved January 23rd, 2020 from: https://www.wired.com/2016/05/dhls-new-drone-can-ship-packages-around-alps/.
2. Optimization approaches for the traveling salesman problem with drone;Agatz;Transportation Science,2018
3. Ai, S.M., 2019. Personal communication, December 1st, 2019.
4. Development of a heavy-duty diesel modal emissions and fuel consumption model;Barth,2005
5. Maximum coverage capacitated facility location problem with range constrained drones;Chauhan;Transportation Research Part C: Emerging Technologies,2019