%% You should probably cite rfc5143 instead of this I-D.
@techreport{malis-sonet-ces-mpls-09,
    number =    {draft-malis-sonet-ces-mpls-09},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-malis-sonet-ces-mpls/09/},
    author =    {Luca Martini and Jeremy Brayley and John Shirron and Stephen Vogelsang and Andrew G. Malis},
    title =     {{Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation Service over MPLS (CEM) Encapsulation}},
    pagetotal = 24,
    year =      2007,
    month =     aug,
    day =       17,
    abstract =  {This document describes a historical method for encapsulating Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Path signals for transport across packet-switched networks (PSNs). The PSNs explicitly supported by this document include MPLS and IP. Note that RFC 4842 describes the standards-track protocol for this functionality, and new implementations must use RFC 4842 rather than this document except when interoperability with older implementations is desired. This memo defines a Historic Document for the Internet community.},
}