ACID-BASE PROPERTIES OF HYDROUS HAFNIUM DIOXIDE IN RELATION TO THE PRETREATMENT TEMPERATURE Article Kostrikin 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. IAPC Nauka/Interperiodica. Vol. 45. 2000. P. 1786-1790