1. Department of Computer Sciences Faculty of Exact and Natural Sciences; Iv.Javakhishvili Tbilisi State University; 2, University st., 0143 Georgia
2. Department of Applied Physics II; Polytechnic School, Malaga University; Campus Teatinos, s/n (29071) Spain
3. Department of Statistics and Operational Research; Faculty of Sciences, Malaga University; Campus Teatinos, s/n (29071) Spain