%% You should probably cite rfc2389 instead of this I-D.
@techreport{ietf-ftpext-feat-02,
    number =    {draft-ietf-ftpext-feat-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-ftpext-feat/02/},
    author =    {Robert Elz and Paul Hethmon},
    title =     {{Feature negotiation mechanism for the File Transfer Protocol}},
    pagetotal = 9,
    year =      1998,
    month =     apr,
    day =       7,
    abstract =  {This document provides a mechanism by which clients of the FTP protocol can discover which new features are supported by a particular FTP server. {[}STANDARDS-TRACK{]}},
}