1. With B. F. Csima. Degrees that are not degrees of categoricity. Notre Dame Journal of Formal Logic, To appear.

2. With B. F. Csima. A bounded jump for the bounded Turing degrees. Notre Dame Journal of Formal Logic, Volume 55, Number 2, 2014, pages 245-264.

3. Relatively computably enumerable reals. Archive for Mathematical Logic, Volume 50, Number 3-4, May 2011, pages 361-365. DOI 10.1007/s00153-010-0219-2.

4. With J. L. Hirst. Partitions of trees and ACA'. Archive for Mathematical Logic, Volume 48, Number 3, 2009, pages 227-230. DOI 10.1007/s00153-009-0122-x.

5. Automorphisms of the truth-table degrees are fixed on a cone. Journal of Symbolic Logic, Volume 74 Number 2, June 2009, pages 679-688.

6. Reals n-generic relative to some perfect tree. Journal of Symbolic Logic, Volume 73 Number 2, June 2008, pages 401-411.

7. Relative properties of reals. PhD Thesis.