Citation: le Page, Y.; McKinnon, W.R.; Barboux, P.; Tarascon, J.M. (1989). Origin of the incommensurate modulation of the 80-K superconductor Bi2 Sr2 Ca Cu2 O8.21 derived from isostructural commensurate Bi10 Sr15 Fe10 O46. Physical Review, Serie 3. B - Condensed Matter (18,1978-), 40, pp. 6810-6816.