Wang, Jinzhong, Elangovan Elamurugu, Vincent Sallet, Francois Jomard, Alain Lusson, Ana Botelho M. do Rego, Pedro Barquinha, Goncalo Goncalves, Rodrigo Martins, and Elvira Fortunato. "Effect of annealing on the properties of N-doped ZnO films deposited by RF magnetron sputtering." Applied Surface Science. 254 (2008): 7178-7182.