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ETUDE AU MICROSCOPE ELECTRONIQUE DE LA CRISTOBALITE ET DE L'OPALE TRIDYMITIQUEBALAKIREV VG; TSINOBER LI; KOVALENKO VS et al.1977; DOKL. AKAD. NAUK S.S.S.R.; S.S.S.R.; DA. 1977; VOL. 233; NO 4; PP. 672-674; BIBL. 4 REF.Article