Affiliation: | 1. Faculty of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Olsztyn, Polanddanuta.kruk@matman.uwm.edu.pl;3. Faculty of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland;4. Institute of Inorganic Chemistry, Graz University of Technology, Graz, Austria;5. Institute of Medical Engineering, Graz University of Technology, Graz, Austria |