%% You should probably cite rfc2597 instead of this I-D.
@techreport{ietf-diffserv-af-06,
    number =    {draft-ietf-diffserv-af-06},
    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-diffserv-af/06/},
    author =    {Walter Weiss and Dr. Juha Heinanen and Fred Baker and John T. Wroclawski},
    title =     {{Assured Forwarding PHB Group}},
    pagetotal = 11,
    year =      1999,
    month =     feb,
    day =       22,
    abstract =  {This document defines a general use Differentiated Services (DS) Per-Hop-Behavior (PHB) Group called Assured Forwarding (AF). {[}STANDARDS-TRACK{]}},
}