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Ultralow blocking temperature and breakdown of the giant spin model in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>Er</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-doped nanoparticles
Improved Optical Degradation Characteristics of Eu Complex Encapsulated by High-Pressure Annealing
The 2 references without a DOI — listed, not checked
no DOI — not checkedM. Humphries, Rare earth elements: The global supply chain, CRS Report for Congress prepared for Members and Committees of Congress (Congressional Research Service, 7-5700 〈www.crs.gov〉, R41347, September. 2011).
no DOI — not checked〈http://geology.com/usgs/lead/〉; the web-site of The Geological Society of America.
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