Daria S. Yasyrkina, Sergei V. Kuznetsov, Pavel P. Fedorov, Valery V. Voronov, Roman P. Ermakov, Anastasia V. Ryabova, Daria V. Pominova, Alexander E. Baranchikov, Vladimir K. Ivanov, Vyacheslav V. Osiko. Effect of the pH on the formation of NaYF4:Yb:Er nanopowders by co-crystallization in presence of polyethyleneimine. // Journal of Fluorine Chemistry. 2014. V.158. p.60-64.