Ke, Changxia Public Economics, MPI for Tax Law and Public Finance, Max Planck Society;
http://ssrn.com/abstract=1934764 (Preprint)
Ke, C., & Bayer, R.-C. (2011). Are 'Rockets and Feathers' Caused by Search or Infromational Frictions? Working Paper of the Max Planck Institute for Tax Law and Public Finance, 2011-12.