1. Cycle Decompositions of Kn and Kn−I
2. Hamiltonian decomposition of Cayley graphs of degree 4
3. and Skolem-type difference sets for cycle systems, preprint.
4. A description of any regular or 1-rotational design by difference methods, Booklet of the abstracts of Combinatorics 2000, pp. 35-52, http://www.mat.uniroma1.it/?combinat/gaeta.pdf.