- Guohua Wu, “Nonisolated degrees and the jump operator”, Annals of Pure and Applied Logic, 117, № 1-3, 2002, 209
- Geoffrey LaForte, “Isolation in the CEA hierarchy”, Arch. Math. Logic, 44, № 2, 2005, 227
- C.T. Chong, A. Li, Y. Yang, “The existence of high nonbounding degrees in the difference hierarchy”, Annals of Pure and Applied Logic, 138, № 1-3, 2006, 31
- Angsheng Li, Guohua Wu, Yue Yang, “Bounding computably enumerable degrees in the Ershov hierarchy”, Annals of Pure and Applied Logic, 141, № 1-2, 2006, 79
- S. Barry Cooper, “Extending and interpreting Post’s programme”, Annals of Pure and Applied Logic, 161, № 6, 2010, 775
- Rod Downey, Angsheng Li, Guohua Wu, “Complementing cappable degrees in the difference hierarchy”, Annals of Pure and Applied Logic, 125, № 1-3, 2004, 101
- S. Barry Cooper, Matthew C. Salts, Guohua Wu, 4978, Theory and Applications of Models of Computation, 2008, 588
- Guohua Wu, “Bi-isolation in the d.c.e. degrees”, J. symb. log., 69, № 2, 2004, 409