Citation: Andriamampianina, V.; Gravereau, P.; Ravez, J.; Abrahams, S. C. (1994). Relationship between the structures of ferroelectric Pb~5~Cr~3~F~19~ and antiferroelectric Pb~5~Al~3~F~19~ at 295 K and the phase III--phase IV transition in Pb~5~Al~3~F~19~ on cooling to about 110 K. Acta Crystallographica Section B, 50, pp. 135-141.