The effect of in vitro co-cultivation of cephaelis ipecacuanha, Eclipta alba and Oryza sativa on plant development and yield of emetine, wedelolactone and demethylwedelolactone - Pereira, A. M. S.; Bertoni, B. W.; Pereira, P. S.; Januário, A. H.; França, S. C.; Lanchote, Vera Lúcia; Queiroz, Regina Helena Costa (Acta Horticulturae, 1999)