Gautier, P. and van der Klaauw, B. (2012). Selection in a field experiment with voluntary participation Journal of Applied Econometrics, 27(1):63--84.
Brown, S., Grundy, B., Lewis, C. and Verwijmeren, P. (2012). Convertibles and hedge funds as distributors of equity exposure Review of Financial Studies, 25(10):3077--3112.