%% You should probably cite rfc2689 instead of this I-D.
@techreport{ietf-issll-isslow-06,
    number =    {draft-ietf-issll-isslow-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-issll-isslow/06/},
    author =    {Carsten Bormann},
    title =     {{Providing Integrated Services over Low-bitrate Links}},
    pagetotal = 14,
    year =      1999,
    month =     jun,
    day =       4,
    abstract =  {This document describes an architecture for providing integrated services over low-bitrate links, such as modem lines, ISDN B-channels, and sub-T1 links. This memo provides information for the Internet community.},
}