Google Scholar:
http://scholar.google.de/citations?user=OtwadyEAAAAJ&hl=de
IDEAS / RePEc:
http://ideas.repec.org/f/pgr330.html
Economist
Google Scholar:
http://scholar.google.de/citations?user=OtwadyEAAAAJ&hl=de
IDEAS / RePEc:
http://ideas.repec.org/f/pgr330.html