Y. Kashiwaba, Y. Tanaka, M. Sakuma, T. Abe, Y. Imai, K. Kawasaki, A. Nakagawa, I. Niikura, Y. Kashiwaba, H. Osada. Preparation of a Non-Polar ZnO Film on a Single-Crystal NdGaO3 Substrate by the RF Sputtering Method. Journal of Electronic Materials. 2018. 47. 8. 1-6