Budnyk, S., Weitzer, F., Kubata, C., Prots, Y., Akselrud, L. G., Schnelle, W., et al. (2006). Barrelane-like germanium clusters in Eu3Ge5: Crystal structure, chemical bonding and physical properties. Journal of Solid State Chemistry, 179(8), 2329-2338. doi:10.1016/j.jssc.2006.05.008.