1. Arímura, M. et al., U.S. Patent 5,532,094; assignors to MEC Co. Ltd.
2. Barbee, S.G. et al. (I), U.S. Patent 5,456,788; assignors to IBM Corp.
3. Barbee, S.G. et al. (II), U.S. Patent 5,480,511; assignors to IBM Corp.
4. Barbee, S.G. et al. (III), U.S. Patent 5,489,361; assignors to IBM Corp.
5. Barbee, S.G. et al. (IV), U.S. Patent 5,500,073; assignors to IBM Corp.