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Burlot-Loison, R.; Pollnau, M.; Krämer, Karl; Egger, P.; Hulliger, Jürg; Güdel, Hans-Ulrich (2000). Laser-relevant spectroscopy and upconversion mechanisms of Er3+ in Ba2YCl7 pumped at 800 nm. Journal of the Optical Society of America. B - optical physics, 17(12), pp. 2055-2067. Optical Society of America 10.1364/JOSAB.17.002055
