%% You should probably cite rfc8767 instead of this I-D.
@techreport{ietf-dnsop-serve-stale-05,
    number =    {draft-ietf-dnsop-serve-stale-05},
    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-dnsop-serve-stale/05/},
    author =    {David C Lawrence and Warren "Ace" Kumari and Puneet Sood},
    title =     {{Serving Stale Data to Improve DNS Resiliency}},
    pagetotal = 12,
    year =      2019,
    month =     apr,
    day =       16,
    abstract =  {This draft defines a method (serve-stale) for recursive resolvers to use stale DNS data to avoid outages when authoritative nameservers cannot be reached to refresh expired data. It updates the definition of TTL from {[}RFC1034{]}, {[}RFC1035{]}, and {[}RFC2181{]} to make it clear that data can be kept in the cache beyond the TTL expiry and used for responses when a refreshed answer is not readily available. One of the motivations for serve-stale is to make the DNS more resilient to DoS attacks, and thereby make them less attractive as an attack vector.},
}