Citation: Abrahams, Sidney C.; Schmalle, Helmut W.; Williams, Tim; Reller, Armin; Lichtenberg, Frank; Widmer, Daniel; Bednorz, J. Georg; Spreiter, Rolf; Bosshard, Christian; G\"unter, Peter (1998). Centrosymmetric or Noncentrosymmetric? Case Study and Structural Redetermination of Sr~5~Nb~5~O~17~. Acta Crystallographica, Section B, 54, pp. 399-416.