%0 Journal Article %A Najafizadeh, Alireza %A Woronowicz, Mateusz %T A note on additive groups of some specific torsion-free rings of rank three and mixed associative rings %J Discussiones Mathematicae. General Algebra and Applications %D 2017 %P 223-232 %V 37 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGAA_2017_37_2_a8/ %G en %F DMGAA_2017_37_2_a8