Computable Shuffle Sums of Ordinals
(Archive for Mathematical Logic, 47:3 (2008), 211-219)
The original publication is available at www.springerlink.com.

Depth Zero Boolean Algebras
(Transactions of the American Mathematical Society, 362 (2010), 4243-4265)
First published in the Transactions of the American Mathematical Society in 362 (2010), published by the American Mathematical Society.

Cuts of Linear Orders
(To Appear in Order)
With Montalbán
The original publication is available at www.springerlink.com.

Subspaces of Computable Vector Spaces
(Journal of Algebra, 314 (2007), 888-894)
With Downey, Hirschfeldt, Lempp, Mileti, and Montalbán
The original publication is available at www.elsevier.com.