Composition #2: Monteiro, Júlio M., Albuquerque, Ulysses P., Lins Neto, Ernani M.F., Araújo, Elcida L., Albuquerque, Miracy M., Amorim, Elba L.C. The effects of seasonal climate changes in the caatinga on tannin levels in Myracrodruon urundeuva (Engl.) Fr. All. and Anadenanthera colubrina (Vell.) Brenan . revista brasileira de farmacognosia, 2006, vol. 16, no. 3, p. 338–344. DOI: 10.1590/S0102-695X2006000300010.
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