1. Cities and Economic Development: From the Dawn of History to the Present;Bairoch,1988
2. Victoires et déboires. Histoire é conomique et sociale du monde du XVIe siècle à nos jours;Bairoch,1997
3. Introduction to Matrix Analysis;Bellman,1970
4. The spatial distribution of wages and employment: estimating the Helpman–Hanson model for Germany;Brakman;Journal of Regional Science,2004
5. Christaller, W., 1933. Die Zentralen Orte in Sü ddeutschland. Jena: Gustav Fischer Verlag (English translation: The Central Places of Southern Germany. Prentice-Hall, Englewood Cliffs, NJ, 1966).