%% You should probably cite rfc6840 instead of this I-D.
@techreport{ietf-dnsext-dnssec-bis-updates-20,
    number =    {draft-ietf-dnsext-dnssec-bis-updates-20},
    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-dnsext-dnssec-bis-updates/20/},
    author =    {Samuel Weiler and David Blacka},
    title =     {{Clarifications and Implementation Notes for DNS Security (DNSSEC)}},
    pagetotal = 21,
    year =      2012,
    month =     sep,
    day =       28,
    abstract =  {This document is a collection of technical clarifications to the DNS Security (DNSSEC) document set. It is meant to serve as a resource to implementors as well as a collection of DNSSEC errata that existed at the time of writing. This document updates the core DNSSEC documents (RFC 4033, RFC 4034, and RFC 4035) as well as the NSEC3 specification (RFC 5155). It also defines NSEC3 and SHA-2 (RFC 4509 and RFC 5702) as core parts of the DNSSEC specification.},
}