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APA Citation
Quasie, O., Zhang, Y., Zhang, H., Luo, J., & Kong, L. (n.d.). four new steroid saponins with highly oxidized side chains from the leaves of Vernonia amygdalina. Phytochemistry letters, 15, 16–20. http://access.bl.uk/ark:/81055/vdc_100031001821.0x00000b