Citation: Wind, Julia; Auckett, Josie E.; Withers, Ray L.; Piltz, Ross O.; Maljuk, Andrey; Ling, Chris D. (2015). Type II Bi~1{-~x}W~x~O~1.5+1.5x~: a (3+3)-dimensional commensurate modulation that stabilizes the fast-ion conducting delta phase of bismuth oxide. Acta Crystallographica Section B, 71, pp. 679-687.