1. Pavol Jozef Šafárik University in Košice, Department of Condensed Matter Physics, Košice, Slovakia
2. Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Russian Federation
3. Comenius University in Bratislava, Department of Physical Chemistry of Drugs, Bratislava, Slovakia
4. Pavol Jozef Šafárik University in Košice, Department of Inorganic Chemistry, Košice, Slovakia