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Β. T. Ibragimov, E. Weber, Κ. M. Beketovn, Κ. Κ. Makhkamov. "Crystal structure of 2′H,7′H-dispiro[fluorene-9,2′-dibenzo[c,e]- oxepine-7′ ,9′′-fluorene], C38H24O." Zeitschrift für Kristallographie - New Crystal Structures 218.JG (2003)