@article {5130,
	title = {Flexibility of β-Sheets: Principal Component Analysis of Database Protein Structures},
	journal = {Proteins: Structure, Function and Genetics},
	year = {2004},
	pages = {91-98},
	doi = {10.1002/prot.10618},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/14997543},
	author = {Eldon G. Emberly and Ranjan Mukhopadhyay and Chao Tang and Ned S. Wingreen}
}
