• C. Spotti, visiting S. Sun at University of California Berkeley (USA), May 2023.
• F. Giusti, visiting M. Garcia-Fernandez at ICMAT Madrid (Spain), Oct-Dec 2022.
• L. Engberg, visiting S. Boucksom at Ecole Polytechnique Paris (France), Feb-March 2020 (interrupted due to Covid).
• C. Spotti, visiting Y. Odaka at Kyoto University, November 2018.