From the OECD. Here are a few articles that explore the EU's approach on sovereign debt crisis. One is form 2011, and the other is from 2012. The 2012 article discusses the "Greece Problem":

  The „Greece problem‟ needs to be resolved once and for all   
  with a 50% (or larger) haircut on its sovereign debt and
  necessary ancillary policies, so that its chances
  or remaining in the euro improve. (2012)

1. 2011 - http://www.oecd.org/finance/financial-markets/49191980.pdf

2. 2012 - http://www.oecd.org/finance/financial-markets/49481502.pdf

3. Greece @ OECD.org: https://data.oecd.org/greece.htm