%% You should probably cite rfc1220 instead of this I-D.
@techreport{ietf-pppext-bridging-01,
    number =    {draft-ietf-pppext-bridging-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-ietf-pppext-bridging/01/},
    author =    {Fred Baker},
    title =     {{Point-to-Point Protocol extensions for bridging}},
    pagetotal = 18,
    year =      1990,
    month =     dec,
    day =       20,
    abstract =  {This document defines an extension of the Internet Point-to-Point Protocol (PPP) described in RFC 1171, targeting the use of Point-to- Point lines for Remote Bridging. {[}STANDARDS-TRACK{]}},
}