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DEGENS, E., LOVE, S. Comparative Studies of Amino-Acids in Shell Structures of Gyraulus trochiformis, Stahl, from the Tertiary of Steinheim, Germany. Nature 205, 876–878 (1965). https://doi.org/10.1038/205876a0
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DOI: https://doi.org/10.1038/205876a0
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