%% You should probably cite draft-ietf-pim-registry instead of this I-D.
@techreport{venaas-pim-registry-01,
    number =    {draft-venaas-pim-registry-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-venaas-pim-registry/01/},
    author =    {Stig Venaas},
    title =     {{A Registry for PIM Message Types}},
    pagetotal = 8,
    year =      2009,
    month =     dec,
    day =       18,
    abstract =  {This document provides instructions to IANA for the creation of a registry for PIM message types. It specifies initial content of the registry based on existing RFCs specifying PIM message types. It also specifies a procedure for registering new types. In addition to this, one message type is reserved, and may be used for a future extension of the message type space.},
}