Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1086016 | PMC |
http://dx.doi.org/10.1073/pnas.19.4.434 | DOI Listing |
Proc Natl Acad Sci U S A
April 1933
Balch Graduate School of the Geological Sciences, California Institute of Technology.
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