%% You should probably cite rfc9523 instead of this I-D.
@techreport{ietf-ntp-chronos-01,
    number =    {draft-ietf-ntp-chronos-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-ntp-chronos/01/},
    author =    {Neta Rozen Schiff and Danny Dolev and Tal Mizrahi and Michael Schapira},
    title =     {{A Secure Selection and Filtering Mechanism for the Network Time Protocol Version 4}},
    pagetotal = 11,
    year =      2020,
    month =     sep,
    day =       3,
    abstract =  {The Network Time Protocol version 4 (NTPv4), as defined in RFC 5905, is the mechanism used by NTP clients to synchronize with NTP servers across the Internet. This document specifies an extension to the NTPv4 client, named Chronos, which is used as a "watchdog" alongside NTPv4, and provides improved security against time shifting attacks. Chronos involves changes to the NTP client's system process only and is backwards compatible with NTPv4 servers.},
}