%% You should probably cite draft-ietf-calext-availability instead of this I-D.
@techreport{daboo-calendar-availability-05,
    number =    {draft-daboo-calendar-availability-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-daboo-calendar-availability/05/},
    author =    {Cyrus Daboo and Mike Douglass},
    title =     {{Calendar Availability}},
    pagetotal = 22,
    year =      2014,
    month =     jan,
    day =       30,
    abstract =  {This document specifies a new iCalendar calendar component that allows the publication of available and unavailable time periods associated with a calendar user. This component can be used in standard iCalendar free-busy lookups, including iTIP free-busy requests, to generate repeating blocks of available or busy time with exceptions as needed. This document also defines extensions to CalDAV calendar-access and calendar-auto-schedule which specify how this new calendar component should be used when doing free-busy time evaluation in CalDAV.},
}