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H. Thommen; F. Leuenberger; R. Berger; S. Liaaen-Jensen. (1976).
Animal carotenoids: 7, 8-didehydroastaxanthin and 7, 8, 7′, 8′-tetradehydroastaxanthin from lobster eggs. , 4(2), 131–132.
doi:10.1016/0305-1978(76)90024-7
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