%0 Journal Article %A I. D. Kormshchikov %A V. V. Voronov %A S. A. Burikov %A T. A. Dolenko %A S. V. Kuznetsov %T Study of stability of luminescence intensity of $\beta$-NaGdF$_4$:Yb:Er nanoparticle colloids in aqueous solution %J Nanosistemy: fizika, himiâ, matematika %D 2021 %P 218-223 %V 12 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/NANO_2021_12_2_a11/ %G en %F NANO_2021_12_2_a11