Li, C., Zheng, H., Sivabalan, S., Sidor, S., and Z. Ali, "Conveying Vendor-Specific Information in the Path Computation Element Communication Protocol (PCEP) Extensions for Stateful PCE", RFC 9752, DOI 10.17487/RFC9752, April 2025, <https://www.rfc-editor.org/info/rfc9752>.