O. Bordun, M. Partyka, I. Medvid, I. Kukharskyy, V. Ptashnyk, and B. Bordun, “Structure and Vibrational Spectra of thin Films β-Ga2O3”, Phys. Chem. Sol. State, vol. 17, no. 4, pp. 515–519, Dec. 2016.