Quetin-Leclercq, J., Elias, R., Balansard, G., Bassleer, R., & Angenot, L. (1992). Cytotoxic activity of some triterpenoid saponins. Planta Medica : natural products and medicinal plant research, 58(3), 279-281. https://doi.org/10.1055/s-2006-961456 (Original work published 1992)