%% You should probably cite draft-ietf-morg-inthread instead of this I-D.
@techreport{gulbrandsen-imap-inthread-05,
	number =	{draft-gulbrandsen-imap-inthread-05},
	type =		{Internet-Draft},
	institution =	{Internet Engineering Task Force},
	publisher =	{Internet Engineering Task Force},
	note =		{Work in Progress},
	url =		{https://datatracker.ietf.org/doc/html/draft-gulbrandsen-imap-inthread-05},
        author =	{Arnt Gulbrandsen},
	title =		{{The IMAP SEARCH=INTHREAD and THREAD=REFS Extensions}},
	pagetotal =	8,
	year =		2008,
	month =		dec,
	day =		15,
	abstract =	{The SEARCH=INTHREAD extension extends the IMAP SEARCH command to operate on threads as well as individual messages. Other commands which search are implicitly extended. The THREAD=REFS extension provides a threading algorithm using (almost) only the References header field for use with the IMAP THREAD command.},
}