“…The examination of this set of papers allows us to identify Italy and China as the most beneficial partners (RCR [1 in both cases) and it is interesting to note that both countries show high specialisation in Mathematics, that is, their share of publications in the field is higher than in all science fields (Harzing and Giroud 2014). Furthermore, among the low R&D countries that more often collaborate with Spain, Latin America is prominent as a regional partner (Brazil, Argentina and Mexico) probably for language-sharing reasons, along with a number of Eastern European Countries, such as Poland, Hungary, Romania or Ukraine, which have been described as specialised in Mathematics (Glänzel 2001;Harzing and Giroud 2014). Among low R&D countries the collaboration with Romania and Ukraine shows a particularly high impact, which again points at the positive effect of specialised partners.…”