%% You should probably cite draft-lior-radius-prepaid-extensions-22 instead of this revision.
@techreport{lior-radius-prepaid-extensions-20,
    number =    {draft-lior-radius-prepaid-extensions-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-lior-radius-prepaid-extensions/20/},
    author =    {Andreas Pashalidis and Kuntal Chowdhury and Avi Lior and Parviz Yegani and Hannes Tschofenig},
    title =     {{Prepaid Extensions to Remote Authentication Dial-In User Service (RADIUS)}},
    pagetotal = 93,
    year =      2011,
    month =     oct,
    day =       31,
    abstract =  {This document specifies an extension to the Remote Authentication Dial-In User Service (RADIUS) protocol that enables service providers to charge for prepaid services. The supported charging models supported are volume-based, duration-based, and based on one-time events.},
}