Spatial and temporal variations in secondary metabolites content of the brazilian arnica leaves (lychnophora ericoides mart., asteraceae) - Gobbo Neto, Leonardo; Bauermeister, Anelize; Sakamoto, Humberto T.; Gouvea, Dayana R.; Lopes, João Luis Callegari; Lopes, Norberto Peporine (Journal of the Brazilian Chemical Society, 2017)