%% You should probably cite draft-ietf-radext-delegated-prefix instead of this I-D.
@techreport{salowey-radext-delegated-prefix-01,
    number =    {draft-salowey-radext-delegated-prefix-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-salowey-radext-delegated-prefix/01/},
    author =    {Joseph A. Salowey and Ralph Droms},
    title =     {{RADIUS Delegated-IPv6-Prefix Attribute}},
    pagetotal = 6,
    year =      2005,
    month =     oct,
    day =       24,
    abstract =  {The Delegated-IPv6-Prefix attribute indicates an IPv6 prefix that is to be delegated to the user.},
}