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Science  25 Jul 1975:
Vol. 189, Issue 4199, pp. 255-260
DOI: 10.1126/science.189.4199.255

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vol. 189 no. 4199 255-260

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  1. Bent Sørensen1
  1. 1Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark

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