"M. Sumiya,K. Yoshimura,T. Ito,K. Ohtsuka,S. Fuke,K. Mizuno,H. Koinuma,A. Ohtomo,M. Kawasaki","Growth mode and surface morphology of a GaN film deposited along the N-face polar direction on c-plane sapphire substrate",,"Journal of Applied Physics",,"Vol. 88","No. 2","pp. 1158-1165",2000,July