http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1020509
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1125742
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1434045
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1424691
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