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Rogerson, F.S.S.; Castro, H.; Fortunato, N.; Azevedo, Z.; Macedo, A.; de Freitas, V.A.P., Chemicals with sweet aroma descriptors found in Portuguese wines from the Douro region: 2,6,6-trimethylcyclohex-2-ene-1,4-dione and diacetyl, J. Agric. Food Chem., 2001, 49, 1, 263-269, https://doi.org/10.1021/jf000948c . [all data]