Authors
Tanja Maksimović
tanja.maksimovic@pmf.unibl.org
University of Banja Luka, Faculty of Sciences and Mathematics, Banja Luka
Svjetlana Lolić
University of Banja Luka, Faculty of Sciences and Mathematics, Banja Luka
Biljana Kukavica
biljana.kukavica@pmf.unibl.org
University of Banja Luka, Faculty of Sciences and Mathematics, Banja Luka