%% You should probably cite rfc6712 instead of this I-D.
@techreport{ietf-pkix-cmp-transport-protocols-16,
    number =    {draft-ietf-pkix-cmp-transport-protocols-16},
    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-pkix-cmp-transport-protocols/16/},
    author =    {Tomi Kause and Martin Peylo},
    title =     {{Internet X.509 Public Key Infrastructure -- HTTP Transport for CMP}},
    pagetotal = 14,
    year =      2012,
    month =     feb,
    day =       16,
    abstract =  {This document describes how to layer the Certificate Management Protocol over HTTP. It is the "CMPtrans" document referenced in RFC 4210 and therefore updates the reference given therein.},
}