Nishizuka, K., Boucadair, M., Reddy.K, T., and T. Nagata, "Controlling Filtering Rules Using Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel", RFC 9133, DOI 10.17487/RFC9133, September 2021, <https://www.rfc-editor.org/info/rfc9133>.