Composition #1: Braga, FC., Kreis, W., Recio, RA., deOliveira, AB. Quantitative evaluation of cardenolides in a Brazilian Digitalis lanata cultivar and perspectives of its industrial use . quimica nova, 1997, vol. 20, no. 5, p. 481–485. DOI: 10.1590/S0100-40421997000500008.
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