1. Specialization and concentration: a note on theory and evidence
2. Estimating the costs and benefits of EMU: The impact of external shocks on labour markets
3. Balland P. A. Rigby D. Boschma R. (2014) The technological resilience of U.S. cities. PEEG Working paper, Utrecht University, Utrecht.
4. Balland P. A. Rigby D. (2015) The geography and evolution of complex knowledge. Papers in Evolutionary Economic Geography, WP15.02, Utrecht University.
5. Borgatti S. Everett M. Freeman L. (2002) UCINET for Windows: Software for Social Network Analysis. Harvard, MA: Analytic Technologies.