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Securing MQTT by Blockchain-Based OTP Authentication.
Buccafurri F, De Angelis V, Nardone R. Buccafurri F, et al. Sensors (Basel). 2020 Apr 3;20(7):2002. doi: 10.3390/s20072002. Sensors (Basel). 2020. PMID: 32260049 Free PMC article.