%% You should probably cite rfc1305 instead of this I-D.
@techreport{mills-ntpv3-01,
    number =    {draft-mills-ntpv3-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-mills-ntpv3/01/},
    author =    {},
    title =     {{Network Time Protocol (Version 3) Specification, Implementation and Analysis}},
    pagetotal = 109,
    year =      1991,
    month =     jul,
    day =       8,
    abstract =  {This document describes the Network Time Protocol (NTP), specifies its formal structure and summarizes information useful for its implementation. {[}STANDARDS-TRACK{]}},
}