Van Geest, D., Bashiri, K., Fluhrer, S., Gazdag, S., and S. Kousidis, "Use of the HSS and XMSS Hash-Based Signature Algorithms in Internet X.509 Public Key Infrastructure", RFC 9802, DOI 10.17487/RFC9802, June 2025, <https://www.rfc-editor.org/info/rfc9802>.