Romney and Ryan's six tax plan "studies"

They've said, "trust us, there are six studies that say our plan works". But is that true? It appears that you've got to abandon some promises Rmoney has made or assume unreasonable growth rates to make their plan work.

Here's a couple of links that look into the details:

http://www.bloomberg.com/news/2012-10-12/the-final-word-on-mitt-romney-s-tax-plan.html

http://www.theatlantic.com/business/archive/2012/10/the-6-studies-paul-ryan-cited-prove-mitt-romneys-tax-plan-is-impossible/263541/

Note: these two links differ in one of the listed studies. I'm unclear on the reason for the difference. The first link calls the source missing in the second link the most significant one.