1. Rare earth elements: a review of applications, occurrence, exploration, analysis, recycling, and environmental impact;Balaram;Geosci. Front.,2019
2. Photoluminescence of rare-earth–doped glasses;Righini;Riv. Nuovo Cimento,2005
3. Special issue: rare earth luminescent materials;Zhang;Light Sci. Appl.,2022
4. See, for instance, The previous special issues of optical materials and ceramics international on photoluminescence of rare earths. https://pre26.fbk.eu/history.