Li, Zhaozheng; Lei, Weimin; Hu, Hanyun; Zhang, Wei (2019). "A Blockchain-based Communication Non-repudiation System for Conversational Service". 2019 IEEE 13th International Conference on Anti-counterfeiting, Security, and Identification (ASID). pp. 6–10. doi:10.1109/ICASID.2019.8924991. ISBN978-1-7281-2458-2. S2CID209320279.
Li, Zhaozheng; Lei, Weimin; Hu, Hanyun; Zhang, Wei (2019). "A Blockchain-based Communication Non-repudiation System for Conversational Service". 2019 IEEE 13th International Conference on Anti-counterfeiting, Security, and Identification (ASID). pp. 6–10. doi:10.1109/ICASID.2019.8924991. ISBN978-1-7281-2458-2. S2CID209320279.