Metabolic profiling and classification of propolis samples from southern brazil: An NMR-based platform coupled with machine learning - Maraschin, M; Somensi-Zeggio, A; Oliveira, S K; Kuhnen, S; Tomazzoli, M M; Raguzzoni, J C; Zeri, A C; Carreira, R; Correia, S; Costa, C; Rocha, M (J Nat Prod, 2016)