Proton magnetic resonance spectra at 220 MHz of amino acids, porcine and bovine insulin and the A and B chains of bovine insulin
Jurnal of M*lecular Spectroscopy, Volume 26, Issue 1, May 1968, Pages 78-97
Børge Bak, Claus Dambmann, Flemming Nicolaisen, Erik Jonas Pedersen and Norman S. Bhacca
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http://dx.doi.org/10.1016/0022-2852(68)90145-8