Citation: Svilen Bobev; Joe D. Thompson; John L. Sarrao; Marilyn M. Olmstead; H\%akon Hope; Susan M. Kauzlarich (2004). Probing the Limits of the Zintl Concept: Structure and Bonding in Rare-Earth and Alkaline-Earth Zinc-Antimonides Yb9Zn4+xSb9 and Ca9Zn4.5Sb9. Inorganic Chemistry, 43, pp. 5044-5052.