COMPOSITION AND THERMAL STABILITY OF AL- AND ZR-CONTAINING GELS PREPARED BY A SOL–GEL SYNTHESIS USING N,N-DIMETHYLOCTYLAMINE AND ACETYLACETONE Article Trusova E.A., Koshcheev A.P., Konovalov A.A., Chipkin P.I., Safronenko M.G., Fortalnova E.A., Khrustalev V.N. Inorganic Materials. Vol. 54. 2018. P. 1231-1237