But there was no study. Just a lot of claims, with no names or actual evidence.
The study is on the arXiv database, and the abstract of the study is listed as well, to which you partially quoted.
Again claims, but no substance, other than this delightful comment "So far, only small national samples were studied and there was no appropriate methodology to assess control globally."
From a small paragraph of literally nothing.
That small paragraph is just the abstract....scholarly works have the abstract up front. Other academics can read the abstract to see if it's useful for their literature review, or for helping to build a hypothesis. For studies that are behind paywalls, all you will see is the abstract unless you pay for the document.
The full abstract:
The structure of the control network of transnational corporations affects global market competition and financial stability. So far, only small national samples were studied and there was no appropriate methodology to assess control globally. We present the first investigation of the architecture of the international ownership network, along with the computation of the control held by each global player. We find that transnational corporations form a giant bow-tie structure and that a large portion of control flows to a small tightly-knit core of financial institutions. This core can be seen as an economic "super-entity" that raises new important issues both for researchers and policy makers.
So, the researchers are saying that up to the point that they decided to investigate their hypothesis, there were only small national samples of financial control. So, they designed a study to test the control on a global scale. They basically performed
network analysis, which showed that a significant portion of the global economy flows through a small number of organizations. As the quote from PhysOrg in the OP mentioned, that's not an unsurprising result.
It's not really different than performing the same type of analysis on a large multinational corporation. The flow of resources to various divisions and business units within the corporation will have large numbers of end units, with very few controls, ie. corporate dictates to the rest of the divisions how much money there is to hire new FTE's and how much money there is for capital expenditures.
If you go to the link at arXiv, you can click the link on the left hand side to get the pdf of the full study.
So while there i went looking for a link that might show the date or some evidence, and found,
Link to the study:
http://arxiv.org/PS_cache/arxiv/pdf/1107/1107.5728v1.pdf