Citation: Gao, Y.; Coppens, P.; Cox, D. E.; Moodenbaugh, A. R. (1993). Combined x-ray single-crystal and neutron powder refinement of modulated structures and application to the incommensurately modulated structure of Bi~2~Sr~2~CaCu~2~O~8+y~. Acta Crystallographica Section A, 49, pp. 141-148.