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Toru Egawa, Akiyo Kameyama, Hiroshi Takeuchi: Structural determination of vanillin, isovanillin and ethylvanillin by means of gas electron diffraction and theoretical calculations. In: Journal of Molecular Structure.2006, 794 (1–3), S. 92–102; doi:10.1016/j.molstruc.2006.01.042; PDF.