Drexl, Josef MPI for Intellectual Property and Competition Law, Max Planck Society;
Drexl, J., Ricolfi, M., Eechoud, M. v., Janssen, K., Maggiolino, M., Morando, F., Sappa, C., Iemme, R., & Vries, M. d. (2011). The "Principles Governing Charging" for Re-use of Public Sector Information. Informatica e diritto, 20(1-2), 105-127.