Is Russia exhausting sources for economic growth?
A very important article from Andres Aslund http://www.themoscowtimes.com/opinion/article/russia-is-losing-sources-of-economic-growth/493094.html
The idea of the 'middle income trap' is covered here: http://www.imf.org/external/pubs/ft/wp/2013/wp1371.pdf
The original research (revised to January 2013) is here: http://www.nber.org/papers/w18673 and non-technical exposition: http://www.voxeu.org/article/growth-slowdowns-redux-avoiding-middle-income-trap and here: http://www.voxeu.org/article/avoiding-middle-income-growth-traps
