Hexagonally-arranged-nanoporous and continuous NiO films with varying electrical conductivity. - Gutiérrez, A.; Domínguez-Cañizares, G.; Jiménez, J.A.; Preda, I.; Díaz-Fernández, D.; Jiménez-Villacorta, F.; Castro, G.R.; Chaboy, J.; Soriano, L. (Applied Surface Science, 2013)