%% You should probably cite rfc6927 instead of this I-D.
@techreport{levine-tld-variant-02,
    number =    {draft-levine-tld-variant-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-levine-tld-variant/02/},
    author =    {John R. Levine and Paul E. Hoffman},
    title =     {{Variants in Second-Level Names Registered in Top Level Domains}},
    pagetotal = 12,
    year =      2012,
    month =     oct,
    day =       17,
    abstract =  {Internationalized Domain Names for Applications (IDNA) provides a method to map a subset of names written in Unicode into the DNS. Some languages allow a particular host name to be written in multiple ways because some characters have multiple representations, often known as "variants". This document surveys the approaches that ICANN-contracted top level domains have taken to the registration and provisioning of domain names that have variants. This document is not (and will not be) a product of the IETF, does not (and will not) propose any method to make variants work "correctly", and is not (and will not be) an introduction to internationalization or IDNA.},
}