%% You should probably cite draft-ietf-ntp-ntpv5 instead of this I-D.
@techreport{mlichvar-ntp-ntpv5-00,
    number =    {draft-mlichvar-ntp-ntpv5-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-mlichvar-ntp-ntpv5/00/},
    author =    {Miroslav Lichvar},
    title =     {{Network Time Protocol Version 5}},
    pagetotal = 15,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document describes the version 5 of the Network Time Protocol (NTP).},
}