Prajzler, V., V. Jeřábek, O. Lyutakov, I. Hüttel, J. Špirková, V. Machovič, J. Oswald, D. Chvostová, and J. Zavadil. “Optical Properties of Erbium and Erbium Ytterbium Doped Polymethylmethacrylate”. Acta Polytechnica 48, no. 5 (January 5, 2008). Accessed May 13, 2025. https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1047.