Publications with shared reference: Microstructural and compositional optimization of La<sub>0.5</sub>Ba<sub>0.5</sub>CoO<sub>3−δ</sub>—BaZr<sub>1−z</sub>Y<sub>z</sub>O<sub>3−δ</sub> (z = 0, 0.05 and 0.1) nanocomposite cathodes for protonic ceramic fuel cells