Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Pacheco, V., Sparn, G., Baenitz, M., et al. (2004). Interplay of superconductivity and structural phase transition in the clathrate Ba6Ge25. Physical Review B, 70(17), 174512-1-174512-6. doi:10.1103/PhysRevB.70.174512.