%% You should probably cite rfc1552 instead of this I-D.
@techreport{ietf-pppext-ipxcp-04,
    number =    {draft-ietf-pppext-ipxcp-04},
    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-ipxcp/04/},
    author =    {William A. Simpson},
    title =     {{The PPP Internetworking Packet Exchange Control Protocol (IPXCP)}},
    pagetotal = 16,
    year =      1993,
    month =     jul,
    day =       2,
    abstract =  {This document defines the Network Control Protocol for establishing and configuring the IPX protocol over PPP. {[}STANDARDS-TRACK{]}},
}