The original paper submission version for
Bogyrbayeva, A., Yoon, T., Ko, H., Lim, S., Yun, H. and Kwon, C., 2023. A deep reinforcement learning approach for solving the traveling salesman problem with drone. Transportation Research Part C: Emerging Technologies, 148, p.103981. DOI: 10.1016/j.trc.2022.103981