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Hoyt, C. W., Patterson, W., Hasselbeck, M. P., Imangholi, B., Sheik-Bahae, M., Epstein, R., Thiede, J., & Seletskiy, D. (2003, June). Laser cooling thulium-doped glass by 24K from room temperature [Paper]. Conference on Lasers and Electro-Optics (CLEO 2003), Baltimore, Maryland. External link