Chan, James S, Nathan W Cheung, Lawrence F Schloss, Erin C Jones, William S Wong, Nathan  Newman, Xiaohong  Liu, Eicke R Weber, A.  Gassman, and Michael D Rubin. "Thermal Annealing Characteristics of Si and Mg-implanted GaN Thin Films." Applied Physics Letters 68.19 (1995) 2702-2704. LBL-37372.