Schautschick, Philipp MPI for Intellectual Property and Competition Law, Max Planck Society;
http://www.economics.ox.ac.uk/materials/papers/12770/paper659.pdf (プレプリント)
Schautschick, P., & Greenhalgh, C. (2013). Empirical studies of trade marks: The existing economic literature. University of Oxford, Department of Economics, Discussion Paper Series, 659.