1. Original problem statement for the IETFMPLS Working Group http://www.ietf.org/proceedings/97apr/97apr-final/xrtftr90.htm
2. T. Walsh R. Cherukuri Two Reference Models for MPLS Control Plane Iinterworking 2005
3. IETF MPLS Working Group http://ietf.org/html.charters/mpls-charter.html