%% You should probably cite rfc9790 instead of this I-D.
@techreport{ietf-mpls-1stnibble-11,
    number =    {draft-ietf-mpls-1stnibble-11},
    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-1stnibble/11/},
    author =    {Kireeti Kompella and Stewart Bryant and Matthew Bocci and Greg Mirsky and Loa Andersson and Jie Dong},
    title =     {{IANA Registry for the First Nibble Following a Label Stack}},
    pagetotal = 17,
    year =      2024,
    month =     nov,
    day =       12,
    abstract =  {This memo creates a new IANA registry (called the Post-stack First Nibble registry) for the first nibble (4-bit field) immediately following an MPLS label stack. The memo offers a rationale for such a registry, describes how the registry should be managed, and provides some initial entries. Furthermore, this memo sets out some documentation requirements for registering new values. Finally, it provides some recommendations that make processing MPLS packets easier and more robust. The relationship between the IANA IP Version Numbers (RFC 2780) and the Post-stack First Nibble registry is described in this document. This document updates RFC 4928 by deprecating the heuristic method for identifying the type of packet encapsulated in MPLS.},
}