Assuncao, V., E. Fortunato, A. Marques, H. Aguas, I. Ferreira, M. E. V. Costa, and R. Martins. "Influence of the deposition pressure on the properties of transparent and conductive ZnO: Ga thin-film produced by rf sputtering at room temperature." Thin Solid Films. 427.1 (2003): 401-405.