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2. Heraeus Quarzglas, Hanau (Germany): Data sheets about All-Silica Preforms
3. Optical Fibers for Astronomy;Nelson,1988
4. Jnfluence of fiber design on light-guidance in step-index fibers for bundle applications in the UV-VIS-region;Ohlmeyer,2014
5. Fiber optics in Astronomy II;Gray,1993