- Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Slovakia
- Institut fur Ferstkörperund Werkstofforschung, Dresden, Germany
- Helmohltz Centrum Berlin, Germany
- Instiutute of Physics, Silesian University, Katowice, Poland
- Institute of Physics, Adam Mickiewicz University, Poznań, Poland
- Institute of Low Temperature and Structure Research, Wrocław, Poland
- Laboratoire de Physique de L,Etat Condense, CNRS, Universite du Maine, France