Central sets in commutative adequate partial semigroups, to appear in Topology Proceedings.

(With T.Carlson, N. Hindman, and D. Strauss) Almost disjoint large subsets of semigroups, to appear in Topology and its Applications.

(With I. Farah and N. Hindman) Partition theorems for layered partial semigroups J. Comb. Theory (Series A) 98 (2002), 268-311.

Some notions of size in partial semigroups Topology Proceedings 25 (2000), 317-332.

• Notions of size in adequate partial semigroups, thesis.