Crystal structure of Ba8Ga4.44Ge39.14□2.42, Ba8Ga8.62Ge36□1.38, and Ba8Ga12.35Ge33.27□0.38, three clathrate-I variants - Carrillo-Cabrera W.; Gil R. Cardoso; Paschen S.; Grin Yu. (Zeitschrift für Kristallographie - New Crystal Structures, 2002)