%% You should probably cite rfc8596 instead of this I-D.
@techreport{ietf-mpls-sfc-encapsulation-04,
    number =    {draft-ietf-mpls-sfc-encapsulation-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-mpls-sfc-encapsulation/04/},
    author =    {Andrew G. Malis and Stewart Bryant and Joel M. Halpern and Wim Henderickx},
    title =     {{MPLS Transport Encapsulation for the Service Function Chaining (SFC) Network Service Header (NSH)}},
    pagetotal = 9,
    year =      2019,
    month =     mar,
    day =       24,
    abstract =  {This document describes how to use a Service Function Forwarder (SFF) Label (similar to a pseudowire label or VPN label) to indicate the presence of a Service Function Chaining (SFC) Network Service Header (NSH) between an MPLS label stack and the packet original packet/ frame. This allows SFC packets using the NSH to be forwarded between SFFs over an MPLS network, and to select one of multiple SFFs in the destination MPLS node.},
}