Modulated vacancy ordering in SrGe6−x (x≈0.45). - Schwarz, Ulrich; Castillo, Rodrigo; Wosylus, Aron; Akselrud, Lev; Prots, Yurii; Wahl, Bernhard; Doert, Thomas; Bobnar, Matej; Grin, Yuri (Zeitschrift für Naturforschung B: A Journal of Chemical Sciences, 2019)