Citation: Sch\"afer, Marion C.; Bobev, Svilen (2013). Copper and Zinc Substitutions in Clathrates of Tin: Synthesis, Structural Characterization, and Physical Properties of A8Cu2.67Sn43.33 and A8Zn4Sn42 (A= K, Rb, Cs) with the Type-I Structure. Chemistry of Materials, 25, pp. 3737-.