Canela, J.D., Lourenço, A.C., Fortes, V.S. e Berretta, A.A. 2012. PNS046 Comparative study of antioxidant activity of different propolis extracts (alcoholic, aqueous and dry) by DPPH method. Revista Eletrônica de Farmácia. 9, 1 (dez. 2012), 1.