On Sat, Mar 16, 2013 at 6:31 PM, Sumana Harihareswara <sumanah@wikimedia.org> wrote:

http://www.dlib.org/dlib/march13/szajewski/03szajewski.html

"This case study examines the use of Wikipedia by the Ball State
University Libraries as an opportunity to raise the visibility of
digitized historic sheet music assets made available in the university's
Digital Media Repository. By adding links to specific items in this
collection to relevant, existing Wikipedia articles, Ball State
successfully and efficiently expanded the user base of this collection
in the Digital Media Repository by vastly enhancing the discoverability
of the collection's assets...

While this research is incredibly valuable, I would be almost hesitant to put it out into the wider English Wikipedia community because adding links for traffic, or the perception there of, could cause backlash. Companies doing that intentionally across pages is often viewed as a form of marketing, and there are pockets of the community that are extremely hostile towards this sort of action because inside the English Wikipedia community, it is viewed as little different than paid editing and link baiting. :/