1. Ether soluble pigments in interglacial gyttja;Andersen;Experienta,1955
2. Paleolimnological evidence from fossil pigments;Brown;Mitt. Int. Ver. Limnol.,1969
3. Analysis of carotenoid pigments;Davies,1965
4. Ionene: a thermal degradation product of β-carotene;Day;Science,1963
5. Leg 15 Deep Sea Drilling Project;Edgar;Geotimes,1971