- USA, Institute for Nuclear Theory, University of Washington, Seattle, International Summer Program "The neutron star crust and surface", June - July 2007
- USA, Department of Physics, The University of Texas at Brownsville, research stay, July 2005
- USA, Department of Physics and Astronomy, University of Nevada, Las Vegas, visiting professor, Jan. - June 2005
- India, GMRT Pune, visiting professor, July - August 2003
- Germany, Potsdam Astrophysical Observatory, Alexander von Humboldt Fellow research stay, Nov. 2002 - Feb. 2003
- China, Institute of Astronomy, Beijing University, visiting professor, June 2002
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