I. Herraiz-Cardona, C. Gonzalez-Buch, E. Ortega, J. Garcia-Anton, and V. Perez-Herranz, “Energy Efficiency Improvement of Alkaline Water Electrolysis by using 3D Ni Cathodes Fabricated via a Double-Template Electrochemical Process”, Chemical Engineering Transactions, vol. 32, pp. 451-456, Jun. 2013.