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I am unable to read the article due to the paywall, so I am left wondering about additional insights since the following 2009 article:

A good approach is to search in scholar to see what other links exist. Here is the link to a preprint https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&d...

I meant the OP's article is paywalled, not the link I gave as a reference.