T. Kim, T. Kawazoe, S. Yamazaki, J. Lim, T. Yatsui, and M. Ohtsu, "Ultraviolet-emission and lasing from ZnO nanostructures fabricated by a simple method involving the low-temperature oxidation of metallic Zn," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference, Technical Digest (Optical Society of America, 2003), paper CTuF5.