“…Some of the most frequently used are the regional provenance, career paths, and scientifi c travel of the people in question (Ackers, L. 2005;Baar-Cantoni, R. and Wolgast, E. 2012;Harvey, W. 2010;Heffernan, M. and Jöns, H. 2013;Jöns, H. 2007Jöns, H. , 2008Jöns, H. , 2009Jöns, H. , 2014Schuch, T. 2010a,b, 2012a,b). Scientifi c relations can be measured by collaboration in joint research projects (Bukau, B. and Tolle, R. 2012;Raditsch, L. 2012;Seltmann, S. 2012), the distribution of coauthors in joint publications (Wellnitz, E.M. 2012), the spatial distribution of former graduates of a professor or faculty (Eckart, W.U.…”