Composition #9: SEGAL, R., DOR, A., DUDDECK, H., SNATZKE, G., ROSENBAUM, D., KAJTAR, M. THE SESQUITERPENE LACTONES FROM ACHILLEA FRAGRANTISSIMA .1. ACHILLOLIDE-A AND ACHILLOLIDE-B, 2 NOVEL GERMACRANOLIDES . tetrahedron, 1987, vol. 43, no. 18, p. 4125–4132. DOI: 10.1016/S0040-4020(01)83452-9.
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