1. Ullmann's Encyclopedia of Industrial Chemistry, Sixth edition, 2002. (electronic).
2. Optically Active Ionones and Derivatives: Preparation and Olfactory Properties
3. CONDENSATION OF CITRAL WITH KETONES AND SYNTHESIS OF SOME NEW IONONES1
4. O. Hertel, H. Kiefer, L. Arnold, US Patent 4 565 894 (1986), to BASF Aktiengesellschaft.
5. U. Rheude, U. Horcher, D. Weller, M. Stroezel, US Patent 6 288 282 (2001), to BASF Aktiengesellschaft.