Composition of the Essential Oils of Ocimum canum, O. gratissimum and O. minimum - Martins, Ana Paula; Salgueiro, Lígia R; Vila, Roser; Tomi, Félix; Cañigueral, Salvador; Casanova, Joseph; da Cunha, António Proença; Adzet, Tomás (Planta Medica, 1999)