%% You should probably cite rfc5333 instead of this I-D.
@techreport{ietf-enum-calendar-service-04,
    number =    {draft-ietf-enum-calendar-service-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-enum-calendar-service/04/},
    author =    {Bernie Hoeneisen and Rohan Mahy},
    title =     {{IANA Registration of Enumservices for Internet Calendaring}},
    pagetotal = 8,
    year =      2008,
    month =     mar,
    day =       10,
    abstract =  {This document registers Enumservices for Internet calendaring. Specifically, this document focuses on Enumservices for scheduling with iMIP (iCalendar Message-Based Interoperability Protocol) and for accessing Internet calendaring information with CalDAV (Calendaring Extensions to WebDAV). {[}STANDARDS-TRACK{]}},
}