Zmojda, Jacek, Dominik Dorosz, Marcin Kochanowicz, and Jan Dorosz. “Spectroscopic Properties of Yb3+ Er3+ - Doped Antimony-Phosphate Glasses for Fiber Amplifiers”. Photonics Letters of Poland 2, no. 2 (June 29, 2010): pp. 76–78. Accessed March 28, 2024. https://www.photonics.pl/PLP/index.php/letters/article/view/2-26.