Involvement of Nitric Oxide in the Mediation of the Hypotensive Action of the Essential Oil of Mentha × villosa in Normotensive Conscious Rats - Lahlou, Saad; Magalhães, Pedro Jorge Caldas; Carneiro-Leão, Ricardo Ferreira Lima; Leal-Cardoso, José Henrique (Planta Medica, 2002)