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XiaoLi Da GuangDi Shen Chen Xu DeShu Zou YanXu Zhu Jia Zhang Investigation of high extraction efficiency flip-chip GaN-based light-emitting diodes. 1476-1482 2009 52 Science in China Series F: Information Sciences 8 http://dx.doi.org/10.1007/s11432-009-0048-2 db/journals/chinaf/chinaf52.html#DaSXZZZ09