@ARTICLE{RZ06, author = {Rettinger, Robert and Zheng, Xizhong}, title = {A hierarchy of {T}uring degrees of divergence bounded computable real numbers}, journal = JC, year = {2006}, volume = {22}, pages = {818--826}, number = {6}, keywords = {bib,cca}, url = {http://dx.doi.org/10.1016/j.jco.2006.04.009} }