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Pollnau, M.; Lüthy, Willy; Weber, Heinz; Krämer, Karl; Güdel, Hans-Ulrich; McFarlane, R. A. (1996). Excited-state absorption in Er: BaY2F8 and Cs3Er2Br9 and comparison with Er: LiYF4. Applied physics. B, Lasers and optics, 62(4), pp. 339-344. Springer 10.1007/BF01081195