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\bibitem{Boulesteix_etal2019} Boulesteix, T., Cathelineau, M., Deloule, E., Brouand, M., Toubon, H., Lach, P., et al. (2019). Ilmenites and their alteration products, sinkholes for uranium and radium in roll-front deposits after the example of South Tortkuduk (Kazakhstan). \textit{Journal of Geochemical Exploration}, \textit{206}, 106343.

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