ACID-BASE PROPERTIES OF HYDROUS HAFNIUM DIOXIDE IN RELATION TO THE PRETREATMENT TEMPERATURE ArticleKostrikin 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. Vol. 45. 2000. P.. 1786-1790