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Ref.329 : Kleinig, H., Heumann, W ., Meister W ., and Englert G. (1977) Carotenoids of Rhizobia. I. New Carotenoids from Rhizobium lupini, Helv. Chim. Acta 60, 254–258. Ref.449 : Kleinig, Hans; Heumann, Wolfram; Meister, Walter; Englert, Gerhard, Helvetica Chimica Acta (1979), 62(8), 2551-7., "Carotenoids of Rhizobia. I. New carotenoids from Rhizobium lupini"
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