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\bibitem{Lioutas_etal1993} {\textquotedblleft}\textit{A 2a2b3c superstructure in hexagonal NiS$_{1-x}$: a study by means of electron diffraction and HREM}{\textquotedblright}. Lioutas CB, Manolikas C, Van Tendeloo G, van Landuyt J, Journal of crystal growth \textbf{126}, 457 (1993)

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