Konrad, Kai A. Public Economics, MPI for Tax Law and Public Finance, Max Planck Society;
http://ssrn.com/abstract=2469268 (Abstract)
Buchholz, W., & Konrad, K. A. (2014). Taxes on Risky Returns — an Update. Working Paper of the Max Planck Institute for Tax Law and Public Finance, No. 2014-10.