Hudak, B., Sun, W., Mackey, J., Ullah, A., Sehirlioglu, A., Dynys, F., Pantelides, S., & Guiton, B. (2019). Observation of Square-Planar Distortion in Lanthanide-Doped Skutterudite Crystals. Journal of Physical Chemistry C, 123 (23), 14632-14638.