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, vol. 48, no. 5, Jan. 2008, doi:10.14311/1047.