1. Please visit the web site 〈http://www.cermetinc.com/〉.
2. Please visit the web site 〈http://www.tew.co.jp/e/〉.
3. Please visit the web site 〈http://www.spcgoodwill.com/〉.
4. The future of ZnO light emitters
5. Zinc Oxide Bulk, Thin films and Nanostructures;Jagadish,2006