Abstract. International collaboration in the creation of knowledge is changing the structural stratification of science, with implications for science policy. Analyses of collaboration in developing and emergent countries are of particular significance because initiatives are often the result of “research-for-aid” arrangements, generally based on North–South asymmetries. However, collaboration for mutual benefit and excellence has gained increasing acceptance, with “partner” selection becoming a strategic priority to enhance one’s own production.

Abstract. Since the discovery of the promising properties of graphene, research in the field has attracted numerous grants and sponsors, leading to an exponential rise in the number of papers and applications. This article presents a global map of graphene research and its intellectual structure, drawn using the terms of more than 50,000 documents extracted from Scopus database, years 1998–2015.

Abstract. The rise of mobilities has paved the way for important changes within cities and the possibility for urban upper-middle classes to exit from their cities and national societies, disinvesting on them, while still taking profits in a process of deterritorialization with important consequences at the collective level. Investigating the extent to which upper-middle classes shaped and are still rooted (or not) in their cities is a challenge, even more when international comparison is involved.