@article{articled4b91558,
title   = {Evidence for the mechanisms underlying the effects of pimaradienoic acid isolated from the roots of Viguiera arenaria on rat aorta},
author = {Tirapelli, Carlos Renato and Ambrósio, Sérgio R. and Costa, Fernando Batista da and Oliveira, Ana Maria de},
year = {2004},
journal   = {Pharmacology}
}