1. Lorenz, Division Rings generated by bilpotent subgroups, preprint.
2. Makar-Limanov, Free subalgebras of division rings, preprint.
3. Resco, Dimension theory for division rings, Israel J. of Maths. 35 215–221
4. Resco, Small, Wadswoth, Tensor products of skew fields and finite generation of subfields, Proc. AMS 77 7–10.
5. Schofield, Stratiform skew fields (to appear).