@misc{AmbosSpiesWeihrauchZheng, author = {Ambos-Spies, Klaus and Weihrauch, Klaus and Zheng, Xizhong}, title = {Weakly computable real numbers}, series = {Journal of Complexity}, volume = {16}, journal = {Journal of Complexity}, number = {4}, issn = {0885-064X}, pages = {676 -- 690}, language = {en} } @misc{WeihrauchZheng, author = {Weihrauch, Klaus and Zheng, Xizhong}, title = {Computability on Continuous, Lower Semi-Continuous and Upper Semi-Continuous Real Functions}, series = {Theoretical Computer Science}, volume = {234}, journal = {Theoretical Computer Science}, number = {1-2}, pages = {109 -- 133}, language = {en} } @misc{ZhengWeihrauch, author = {Zheng, Xizhong and Weihrauch, Klaus}, title = {The arithmetical hierarchy of real numbers}, series = {Mathematical Logic Quarterly}, volume = {47}, journal = {Mathematical Logic Quarterly}, number = {1}, issn = {0942-5616}, pages = {51 -- 65}, language = {en} }