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Allain, J. Y., Monerie, M., Poignant, H., & Georges, T. (1993).
High-efficiency ytterbium-doped fluoride fibre laser. Journal of Non-Crystalline Solids, 161, 270–273.
doi:10.1016/0022-3093(93)90715-a
10.1016/0022-3093(93)90715-a
