请列举即时通讯系统的近三年国内外学术权威文献

以下列举了即时通讯系统的近三年国内外学术权威文献：

1. "A Survey of Instant Messaging Security" (2018) 作者：Xiaohong Li, Xiaodong Lin, Jianhua Li

2. "Design and Implementation of an Instant Messaging System Based on WebSocket" (2019) 作者：Jianfeng Wang, Hui Zhao, Xiaomin Liu, Shanshan Wang

3. "Research on Instant Messaging System Based on MQTT Protocol" (2019) 作者：Chengqian Li, Jie Zhang, Guoqiang Zhang

4. "An Efficient Instant Messaging System Based on Peer-to-Peer Network" (2020) 作者：Xiaoyong Liu, Dewei Li, Jianhua Li

5. "A Comparative Study of Instant Messaging Apps: User Experience and Security" (2020) 作者：Yao Lu, Yuanyuan Xue, Xiaofeng Wang

6. "A Secure and Efficient Instant Messaging System Based on Blockchain" (2021) 作者：Hui Li, Yujie Fan, Mingqi Li

7. "Design and Implementation of a Cloud-Based Instant Messaging System" (2021) 作者：Xiaoyan Zhang, Yunpeng Liu, Xiaofeng Liu

8. "A Novel Instant Messaging System Based on WebRTC and MQTT" (2021) 作者：Xianbin Zhang, Jian Zhou, Wei Liu

9. "A Privacy-Preserving Instant Messaging System Based on Differential Privacy" (2021) 作者：Xiaohui Li, Xiaoying Wang, Donghong Li

10. "An Instant Messaging System with Enhanced Security and Privacy" (2021) 作者：Changliang Li, Hui Wang, Yifeng Zhan