Antimicrobial Activity and Chemical Composition of the Bark Oil of Croton stellulifer, an Endemic Species from S. Tomé e Príncipe - Martins, Ana Paula; Salgueiro, Lígia R; Gonçalves, Maria José; Vila, Roser; Tomi, Félix; Adzet, Tomás; Proença da Cunha, António; Cañigueral, Salvador; Casanova, Joseph (Planta Medica, 2000)