Newman, P., Edwards, W., Hinden, R., Hoffman, E., Ching Liaw, F., Lyon, T., and G. Minshall, "Ipsilon Flow Management Protocol Specification for IPv4 Version 1.0", RFC 1953, DOI 10.17487/RFC1953, May 1996, <https://www.rfc-editor.org/info/rfc1953>.