P.P. Fedorov, M.N. Mayakova, R.V. Gaynutdinov, N.Yu. Tabachkova, G.A. Komandin, A.E. Baranchikov, E.V. Chernova, S.V. Kuznetsov, V. K. Ivanov, V.V.Osiko. Investigation of the deposition of calcium fluoride nanoparticles on the chips of CaF2 single crystals. Condensed Matter and Interphases. 2021;23(4): 607–613.