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Diels, O.; Beckmann, R.; Toennies, G. Liebigs Annalen der Chemie, 1924 , vol. 439, p. 76 - 96 Full Text Show Details Diels, O. Angewandte Chemie, 1926 , vol. 39, p. 1025 - 1028 Full Text Show Details Gmelin Handbook: C: MVol.C1, 45, page 97 - 99