%0 Journal Article %T Some commutativity results for certain rings %A M. A. Khan %A A. Madugu %J International Journal of Algebra %D 2013 %I %K Division ring %K factor subring %K polynomial identity %K s-unital ring %K torsion-free ring %U http://www.m-hikari.com/ija/ija-2013/ija-1-4-2013/khanIJA1-4-2013.pdf