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\bibitem{Dluzewski_etal2000} {\textquotedblleft}\textit{Electron microscopy and X-ray structural investigations of incommensurate spin-ladder Sr$_{4.1}$Ca$_{4.7}$Bi$_{0.3}$Cu$_{17}$O$_{29}$ single crystals}{\textquotedblright}. Dluzewski P, Pietraszko A, Kozlowski M, Szczepanska A, Gorecka J, Baran M, Leonyuk L, Babonas GJ, Lebedev OI, Szymczak R, Acta physica Polonica: A: general physics, solid state physics, applied physics \textbf{98}, 729 (2000)

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