%0 Journal Article %T A description of quasi-duo Z-graded rings %A Andre Leroy %A Jerzy Matczuk %A Edmund R. Puczylowski %J Mathematics %D 2009 %I arXiv %X A description of right (left) quasi-duo Z-graded rings is given. It shows, in particular, that a strongly Z-graded ring is left quasi-duo if and only if it is right quasi-duo. This gives a partial answer to a problem posed by Dugas and Lam in [1]. %U http://arxiv.org/abs/0910.5381v1