André Didier Adalberto Farias Alexandre Mota Checking Z Data Refinements Using Traces Refinement. 129-148 2009 240 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2009.05.049 db/journals/entcs/entcs240.html#DidierFM09