Page 228 - Handbook of Lasers
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234.  Sun, Y., Judkins, J. B., Srivastava, A. K. et al., Transmission of 32-WDM 10-Gb/s channels
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                         235.  Zellmer, H., Riedel, P., and Tünnermann, A., Visible upconversion lasers in praseodymium-
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