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@article{Vila_2009,  doi = {10.1002/jcc.21105}, {10.1073/pnas.0908833106},  url = {http://dx.doi.org/10.1002/jcc.21105}, {http://dx.doi.org/10.1073/pnas.0908833106},  year = {2009},  month = {apr}, {sep},  publisher = {Wiley-Blackwell}, {Proceedings of the National Academy of Sciences},  volume = {30}, {106},  number = {6}, {40},  pages = {884--892}, {16972--16977},  author = {Jorge {J.  A. Vila and H{\'{e}}ctor Y. A. Arnautova and O.  A. Baldoni Martin  and Harold H.  A. Scheraga}, title = {{Performance of density functional models to reproduce observed 13 C $\upalpha$ {{Quantum-mechanics-derived 13C~  chemical shifts of proteins in solution}}, shift server ({CheShift}) for protein structure validation}},  journal = {J. Comput. Chem.}, {Proceedings of the National Academy of Sciences},  }