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https://www.mdpi.com/1420-3049/27/11/3522 Synthesis of Holmium-Oxide Nanoparticles for Near-Infrared Imaging and Dye-Photodegradation The development of multifunctional nanomaterials has received growing research interest, thanks to its ability to combine multiple properties for severing... holmium oxide https://nrc-publications.canada.ca/eng/view/object/?id=1508ab4c-51ae-45a9-8a0d-d2ec590576fa An international evaluation of holmium oxide solution reference materials for wavelength... An international evaluation of holmium oxide solution reference materials for wavelength calibration in molecular absorption spectrophotometry holmium oxidereference materialsinternationalevaluation