Prediction of occurrences of diverse chemical classes in the Asteraceae through artificial neural networks - Ferreira, Marcelo J. P; Brant, Antônio Jedson Caldeira; Rufino, Alessandra Rodrigues; Alvarenga, Sandra Aparecida Vestri; Magri, Fátima Maria Motter; Emerenciano, Vicente de Paulo (Phytochemical Analysis, 2004)