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Crystal structure and properties of some filled and unfilled skutterudites: Gd Fe4 P12, Sm Fe4 P12, Nd Fe4 As12, Eu0.54 Co4 Sb12, Fe0.5 Ni0.5 P3, Co P3 and Ni P3, Zeitschrift fuer Anorganische und Allgemeine Chemie 626, 1112 (2000)