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               <mods:identifier type="citation">C. S. Alvarez-Merino, H. Q. Luo-Chen, E. J. Khatib and R. Barco, "Opportunistic Fusion of Ranges From Different Sources for Indoor Positioning," in IEEE Communications Letters, vol. 25, no. 7, pp. 2260-2264, July 2021, doi: 10.1109/LCOMM.2021.3074960</mods:identifier>
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