Ayyangar, A., Kompella, K., Vasseur, J., and A. Farrel, "Label Switched Path Stitching with Generalized Multiprotocol Label Switching Traffic Engineering (GMPLS TE)", RFC 5150, DOI 10.17487/RFC5150, February 2008, <https://www.rfc-editor.org/info/rfc5150/>.