- ICTP - International Centre for Theoretical Physics, Trieste - Italy
- University of Trieste - Italy
- University of Udine - Italy
- University of Bologna - Italy
- University of Warwick - UK
- University of Cambridge - UK
- University of Oxford - UK
- Sofia University "St. Kliment Ohridski" - Bulgaria
- JINR - Joint Institute for Nuclear Research, Dubná (Moscow region) - Russia
- MGU – Moscow State University “Lomonosov” - Russia
- Institute of Mathematics “Steklov”, Russian Academy of Sciences, Moscow - Russia
- Fudan University, Shanghai - China
- Rio de Janeiro State University - Brazil