%0 Journal Article %A Redakcija %T Retraction: Retraction Notice to: the Special Issue of Filomat no. 34:15 (2020) %J Filomat %D 2022 %P 2503 %V 36 %N 7 %U http://geodesic.mathdoc.fr/articles/10.2298/FIL2207503E/ %R 10.2298/FIL2207503E %G en %F 10_2298_FIL2207503E