Szczeszak A., Grzyb T., Nowaczyk G., Ekner-Grzyb A. 2020. Emission colour changes in the CaF2 sub-microspheres doped with Yb3+, Er3+ and Mn2+ ions. Journal of Alloys and Compounds. 817: 152718. doi:10.1016/j.jallcom.2019.152718

Szczeszak A., Grzyb T., Nowaczyk G., Ekner-Grzyb A. 2020. Emission colour changes in the CaF2 sub-microspheres doped with Yb3+, Er3+ and Mn2+ ions. Journal of Alloys and Compounds. 817: 152718. doi:10.1016/j.jallcom.2019.152718