ACID-BASE PROPERTIES OF HYDROUS HAFNIUM DIOXIDE IN RELATION TO THE PRETREATMENT TEMPERATURE СтатьяKostrikin A.V., Gorichev I.G., Spiridonov F.M., Lin'ko I.V., Ezhov A.I., Zaitsev B.E., Martynova S.V., Khlupov A.Yu.Russian Journal of Inorganic Chemistry. Том 45. 2000. С. 1786-1790