1. Ministry of Transport of the People's Republic of China (MOT). Statistics of major production indicators of CAAC in 2020. [updated 2021 April 9
2. cited 2021 May 24]. Available from: https://www.mot.gov.cn/tongjishuju/minhang/202104/t20210419_3573714.html [Chinese].
3. National Development and Reform Commission (NDRC), Ministry of Transport of the People's Republic of China (MOT), China Railway Corporation (CR). Medium- and long-term railway network planning. [updated 2017 May 16
4. cited 2021 May 24]. Available from: https://www.ndrc.gov.cn/fggz/fzzlgh/gjjzxgh/201705/P020191104624224120416.pdf [Chinese].
5. Multiple air route crossing waypoints optimization via artificial potential field method;Pang;Chin J Aeronaut,2021