https://zh.wikipedia.org/wiki/%E4%BD%99%E8%8C%82%E6%98%A5
https://www.usna.edu/Users/history/yu/index.php
https://www.epochtimes.com/gb/4/8/19/n633125.htm
https://www.amazon.com/Routledge-Handbook-Chinese-Security-Dittmer/dp/1138244554
https://www.amazon.com/Military-History-China-David-Graff/dp/0813135842/ref=sr_1_1?dchild=1&keywords=Maochun+Miles+Yu&qid=1592356793&s=books&sr=1-1
