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2. Hag, Bd. 5, S. 418–422
3. Firma CF. Roeper (1989) Artikel-Liste, Hamburg
4. Wadia MS, Khurana RG, Mhaskar VV, Dec S (1969) Tetrahedron 25:3841–3854
5. Pandhave ED, Rama Rao AV, Srinivasan R, Venkataraman K (1966) Tetrahedron 229 (Suppl 8, Part 1)