“DOUBLE MOLYBDATES-TUNGSTATES SYSTEM MR(EO4), WHERE M – NH4, Ag, Cu, Tl, R – TRIVALENT METAL, E – Mo, W: DOI: Https: doi.Org 10.17721 1728-2209.2018.1(55).4”. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry, vol. 55, no. 1, Jan. 2019, pp. 19-24, https://chemistry.bulletin.knu.ua/article/view/8441.