%% You should probably cite draft-ietf-calext-ical-tasks instead of this I-D.
@techreport{apthorp-ical-tasks-02,
    number =    {draft-apthorp-ical-tasks-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-apthorp-ical-tasks/02/},
    author =    {Adrian Apthorp and Cyrus Daboo and Michael Douglass},
    title =     {{Task Extensions to iCalendar}},
    pagetotal = 30,
    year =      2021,
    month =     may,
    day =       10,
    abstract =  {This document defines extensions to the Internet Calendaring and Scheduling Core Object Specification (iCalendar) (RFC5545) to provide improved status tracking, scheduling and specification of tasks. It also defines how Calendaring Extensions to WebDAV (CalDAV) (RFC 4791) servers can be extended to support certain automated task management behaviours.},
}