@article{DMGAA_2017_37_2_a8,
     author = {Najafizadeh, Alireza and Woronowicz, Mateusz},
     title = {A note on additive groups of some specific torsion-free rings of rank three and mixed associative rings},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {223--232},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2017_37_2_a8/}
}