%% You should probably cite rfc4064 instead of this I-D.
@techreport{ietf-mip4-experimental-messages-02,
    number =    {draft-ietf-mip4-experimental-messages-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-ietf-mip4-experimental-messages/02/},
    author =    {Alpesh Patel and Kent Leung},
    title =     {{Experimental Message, Extensions, and Error Codes for Mobile IPv4}},
    pagetotal = 11,
    year =      2004,
    month =     sep,
    day =       14,
    abstract =  {Mobile IPv4 message types range from 0 to 255. This document reserves a message type for use by an individual, company, or organization for experimental purposes, to evaluate enhancements to Mobile IPv4 messages before a formal standards proposal is issued. {[}STANDARDS-TRACK{]}},
}