Konrad, Kai A. Public Economics, MPI for Tax Law and Public Finance, Max Planck Society;
http://ssrn.com/abstract=2111895 (Any fulltext)
Konrad, K. A., & Keen, M. (2012). The Theory of International Tax Competition and Coordination. Working Paper of the Max Planck Institute for Tax Law and Public Finance, No. 2012-06.