Supercritical extraction of coumarin from guaco (Mikania laevigata and Mikania glomerata) for pharmaceutical applications - Oliveira, Alessandra Lopes de; Pozza, Letícia Nasser Lauandos; Santos, Débora Nascimento e; Kamimura, Eliana Setsuko; Vicente, Eduardo; Cabral, Fernando Antonio (Journal of Supercritical Fluids, 2013)