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      Invited
Talks
Seminars: 
       
       
      
      
        - Moscow University, Russia, USSR (1971,
1978, 1982);
 
        - Steklov Institute, Moscow, Russia, USSR
(1975, 1978 , 1980, 1984);
 
        - Joint Institute for Nuclear Research,
Dubna, Russia, USSR (1976, 1977,
 
        - 1980, 1984, 1986, 1990);
 
        - Rostok University, DDR (1977);
 
        - Prague University, Czechoslovakia (1979)
 
        - Kharkov University, Ukraine, USSR (1983);
 
        - Institute of Condensed Matter Physics,
Lviv, Ukraine (1983, 1996, 1998);
 
        - Dublin Institute for Advanced Studies,
Ireland (1990, 2016, 2017);
 
        - Viena University, Austria (1993);
 
        - Rome University \La Sapienza", Italy (1993);
 
        - Wroclaw University, Poland (1993, 1994);
 
        - Bielefeld University, BiBoS, Germany (1993,
1994, 1995, 1997, 1998,
 
        - 1999, 2000, 2001, 2002, 2003, 2004);
 
        - Fachbereich Physik der Univ.
Munchen,Germany (1996);
 
        - CPT-C.N.R.S.-Luming, Marseille, France
(1994, 1996, 2002, 2008).
 
       
       
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