University of Odense (Denmark),
University of Cambridge (England),
University of Sussex (England),
University of Portsmouth(England),
University of Glasgow (Scotland),
University of Greifswald (Germany),
University of Rostock (Germany),
University of Cologne (Germany),
Max-Planck Institute for Gravitational Physics Golm (Germany),
Kharkov Institute of Physics and Technology (Ukraine),
Bogolyubov Institute for Theoretical Physics Kiev (Ukraine),
Bogolyubov Laboratory for Theoretical Physics Dubna (Russia),
University of Napoli (Italy),
Jan Pawel II Catholic University of Lublin (Poland),
Copernicus Center for Interdisciplinary Studies, Kraków (Poland).