%% You should probably cite rfc6638 instead of this I-D.
@techreport{desruisseaux-caldav-sched-12,
    number =    {draft-desruisseaux-caldav-sched-12},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-desruisseaux-caldav-sched/12/},
    author =    {Cyrus Daboo and Bernard Desruisseaux},
    title =     {{Scheduling Extensions to CalDAV}},
    pagetotal = 78,
    year =      2012,
    month =     apr,
    day =       2,
    abstract =  {This document defines extensions to the Calendaring Extensions to WebDAV (CalDAV) "calendar-access" feature to specify a standard way of performing scheduling operations with iCalendar-based calendar components. This document defines the "calendar-auto-schedule" feature of CalDAV. {[}STANDARDS-TRACK{]}},
}