V. Y. Gvozdetskyi, R. E. Gladyshevskii, and N. V. German, “Multicomponent Phases with CeAl2Ga2- and Y0.5Co3Ge3-Type Structures in the Gd–Ca–Fe–Co–Ge System”, Phys.Chem.Sol.State, vol. 16, no. 1, pp. 104–110, Dec. 2019.