%0 Journal Article %A Čupona Georgi %A Crvenković Siniša %A Vojvodić Gradimir %T Subalgebras of commutative semigroup satisfying xr+xr+m %J Novi Sad Journal of Mathematics %D 1981 %P 217-230 %V 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_20/ %F NSJOM_1981_11_Nonea_20