Niger. University of Maradi [O. Abdou-Arbi]
Poland. Politechnika Wroclawska [W. Dyrka]
India. VIT University, Vellore [K. Lakshmanan]
Chile. University of Chile [A. Siegel, C. Frioux]
Germany. University of Potsdam [L. Bourneuf, 3 months (nov 2017 - jan 2018)]