Reference for tz?

[Joseph S. Myers]

The recent appearence of a new way to refer to the tz database -
`government database' - caused me to wonder: is there any reference that
is appropriate to cite when referring to the tz code and data?  That is:
since there isn't anything much in the way of a web page for the project,
has there ever been any form of publication (academic paper, memo, ...),
even a long time ago, describing the project/code/data?

-- 
Joseph S. Myers
jsm28 at cam.ac.uk