As much as I would love to believe this, no specific studies are cited...

It seems like the study is as of yet unpublished. Google Scholar didn't turn up anything, and the researcher's web page doesn't list it.

http://www.managementmarketing.unimelb.edu.au/who/staff.cfm?...

Only half true. It did link to a University of Melbourne page, which is slightly more precise and is based on an interview with a researcher in the field:

http://uninews.unimelb.edu.au/news/5750/