Kochanowicz M, Mazerski W, Żmojda J, Czajkowski K, Dorosz D. Green upconversion emission in tellurite optical fibre codoped with Yb3+/Er3+. Photonics Lett. Pol. [Internet]. 2013 Mar. 28 [cited 2024 Nov. 20];5(1):pp. 35-37. Available from: http://m.photonics.pl/PLP/index.php/letters/article/view/5-13