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Econometrica > 90 > 6 > 2645 - 2683
Journal of Health Economics > 2014 > 37 > Complete > 181-197
Business Economics > 2006 > 41 > 4 > 39-45
Cybernetics and Systems Analysis > 2006 > 42 > 5 > 702-713
Cybernetics and Systems Analysis > 2005 > 41 > 3 > 403-414
Cybernetics and Systems Analysis > 2004 > 40 > 1 > 86-96