D. Artamonov and  A. Tsibulnikova and  I. Samusev and  V. Bryukhanov and  A. Kozhevnikov,  Optically Active Material Based on Bi2O3@Yb3+, Nd3+ with High Intensity of Upconversion Luminescence in the Red and Green Region.   journal   = {International Journal of Psychological and Behavioral Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2024, vol. 207(3). 20 - 23
    [viewed 28 April 2024]. Available from: https://publications.waset.org/pdf/10013563.