%% You should probably cite rfc1575 instead of this I-D.
@techreport{ietf-noop-echo-01,
    number =    {draft-ietf-noop-echo-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-noop-echo/01/},
    author =    {Susan Hares and Cathy Wittbrodt},
    title =     {{An Echo Function for CLNP (ISO 8473)}},
    pagetotal = 9,
    year =      1993,
    month =     apr,
    day =       23,
    abstract =  {This memo defines an echo function for the connection-less network layer protocol. The mechanism that is mandated here is in the final process of being standardized by ISO as "Amendment X: Addition of an Echo function to ISO 8473" an integral part of Version 2 of ISO 8473. {[}STANDARDS-TRACK{]}},
}