%% You should probably cite rfc2509 instead of this I-D.
@techreport{engan-ip-compress-02,
    number =    {draft-engan-ip-compress-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-engan-ip-compress/02/},
    author =    {Carsten Bormann and Stephen L. Casner and Mathias Engan},
    title =     {{IP Header Compression over PPP}},
    pagetotal = 10,
    year =      1997,
    month =     dec,
    day =       23,
    abstract =  {This document describes an option for negotiating the use of header compression on IP datagrams transmitted over the Point-to-Point Protocol. It defines extensions to the PPP Control Protocols for IPv4 and IPv6. {[}STANDARDS-TRACK{]}},
}