Yunus, Y.; Suprapti,T. Junaedi, W. Antibacterial Activity of the Essensial Oils of Lempuyang Wangi (<i>Zingiber Aromaticum </i>Val.), Lempuyang Gajah (<i>Zingiber zerumbet</i> Sm), and Lempuyang Emprit (<i>Zingiber Amaricans </I>Bl.) on Three Gram Negative Bacteria. AJAS 2015, 3.