Http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665 http://papers.ssrn.com/sol3/papers.cfm?abstract_id=5301665