1. Lactucaxanthin, an ε,ε-carotene-3,3′-diol from Lactuca sativa
2. H. Mayer, Abstracts, 6th International Symp. Carotenoids, 1981.
3. W. Vetter, G. Englert, N. Rigassi and U. Schwieter, Spectroscopic Methods, Chapter IV in Carotenoids, O. Isler (Edit.), 189–266, Birkhäuser, Basle (1971).
4. Absolute configuration of eschscholtzxanthin
5. G. Englert and M. Vecchi, to be published.