•Vilnius University fellowship: for studies at Kiev university (1970-1972).
•New York University fellowships: for scientific work in 1989 and 1990.
•DFG: Fellowship for scientific work at the University of Dusseldorf in 1990 and 1991.
•NWO: Fellowship for scientific work at the Free University of Amsterdam in 1991 and 2002
•Multiple visits at the Free University in Amsterdam, from 1992 to 2003.
•University of Umea fellowship in 1992 and 1994.
•Scientific visit to Lund university, 1995 and 2002.
•Scientific visits to the Institute of Atomic and Molecular Sciences of Academia Sinica, Taipei, Taiwan in 2001 to 2004.
•Fulbright fellowship for research in University of California at Berkeley, 2004-2005.