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Magnetic Resonance in Chemistry, 1991, Volume 29, Issue 11, Pages 1147 - 1151.
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http://dx.doi.org/10.1002/mrc.1260291112Science, 1996, Vol. 274. no. 5292, pp. 1531 - 1534.
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http://dx.doi.org/10.1126/science.274.5292.1531