%% You should probably cite rfc8457 instead of this I-D.
@techreport{ietf-extra-specialuse-important-04,
    number =    {draft-ietf-extra-specialuse-important-04},
    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-extra-specialuse-important/04/},
    author =    {Barry Leiba},
    title =     {{IMAP "\$Important" Keyword and "\textbackslash{}Important" Special-Use Attribute}},
    pagetotal = 11,
    year =      2018,
    month =     jun,
    day =       7,
    abstract =  {RFC 6154 created an IMAP special-use LIST extension and defined an initial set of attributes. This document defines a new attribute, "\textbackslash{}Important", and establishes a new IANA registry for IMAP folder attributes, which include the attributes defined in RFCs 5258, 3501, and 6154. This document also defines a new IMAP keyword, "\$Important", and registers it in the registry defined in RFC 5788.},
}