The 4th International Conference on Nitride Semiconductors (ICNS 4), page. 48, 2001-07-16
The 5th International Symposium on Blue Laser and Light Emitting Diodes (ISBLLED-2004), 2004-03-15
2000 Materials Research Society (MRS) Fall meeting, page. 179, 2000-11-27
2001 Materials Research Society (MRS) Fall meeting, page. 206, 2001-11-26