The origin of triple conductivity and water uptake in layered double perovskites: A case study on lanthanum-substituted GdBaCo2O6−δ. - Malyshkin, Dmitry; Novikov, Andrey; Ivanov, Ivan; Sereda, Vladimir; Tsvetkov, Dmitry; Zuev, Andrey (Journal of Alloys & Compounds, 2020)