Semi-Definite Rules for the Indefinite Article
http://www.redhatmagazine.com/2007/02/26/how-to-write-really-good-documentationsemi-definite-rules-for-the-indefinite-article/

Forte, Brian
Red Hat Magazine
2007

Abstract:

Technical writing–perhaps more than any other sort of writing–gets read and used by people from every corner of the Anglophonic world. And people don’t get less sensitive to perceived slights or the appearance of cultural insensitivity because it’s a manual or help page. If anything, they’re more sensitive in such a circumstance.