%% You should probably cite draft-ietf-ntp-over-ptp instead of this I-D.
@techreport{mlichvar-ntp-over-ptp-00,
    number =    {draft-mlichvar-ntp-over-ptp-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-over-ptp/00/},
    author =    {Miroslav Lichvar},
    title =     {{NTP Over PTP}},
    pagetotal = 5,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document specifies a transport for the Network Time Protocol (NTP) client-server mode using the Precision Time Protocol (PTP) to enable hardware timestamping on hardware that can timestamp PTP messages but not NTP messages.},
}