Journal Article
Esquivel, B.; Sanchez, A. A.; Vergara, F.; Matus, W.; Hernandez-Ortega, S.; Ramirez-Apan, M. T.: Abietane diterpenoids from the roots of some Mexican Salvia species (Labiatae): Chemical diversity, phytogeographical significance, and cytotoxic activity. Chemistry and Biodiversity
2 (6), pp. 738 - 747 (2005)