APP注销难：设置重重障碍 为留住用户手段五花八门 (Difficulty in uninstalling smartphone apps raises privacy concerns)
Xinhua, July 6, 2018
http://www.xinhuanet.com/zgjx/2018-07/06/c_137305184.htm
Guangzhou subway considering facial recognition for security checks
SupChina, July 6, 2018
https://supchina.com/2018/07/06/guangzhou-subway-considering-facial-recognition-for-security-checks/