[1] Serbian Acad Sci, Math Inst, Knez Mihailova 36-3, Belgrade 11000, Serbia
[2] China Med Univ, China Med Univ Hosp, Dept Med Res, Taichung 40402, Taiwan
[3] Asia Univ, Dept Comp Sci & Informat Engn, 500 Lioufeng Rd, Taichung 41354, Taiwan
[4] Brno Univ Technol, Fac Elect Engn & Commun, Dept Math, Tech 3058-10, CZ-61600 Brno, Czech Republic
[5] Univ Belgrade, Fac Elect Engn, Bulevar Kralja Aleksandra 73, Belgrade 11000, Serbia
[6] Appalachian State Univ, Dept Math Sci, Boone, NC 28608 USA
[7] Brno Univ Technol, CEITEC BUT, Purkynova 656-123, Brno 61600, Czech Republic