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Dauben et al. Journal of the American Chemical Society, 1954 , vol. 76, p. 4420,4425 Full Text Show Details Hueckel; Tappe; Legutke Justus Liebigs Annalen der Chemie, 1940 , vol. 543, p. 191,210 Full Text Show Details Hueckel Justus Liebigs Annalen der Chemie, 1938 , vol. 533, p. 1,26