Use of 13C-NMR as complementar identification tool in essential oil analysis - Alencar, José Wilson; de Vasconcelos Silva, Maria Goretti; Machado, Maria Iracema Lacerda; Craveiro, Afrânio Aragão; de Abreu Matos, Francisco José; de Abreu Magalhães, Ruy (Spectroscopy, 1997)