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Ananthanarayanan, VS and Brahmachari, SK and Vijayan, M (1980) Beta-Turn Conformation of N-Acetyl-Pro-Gly-Phe-Oh in crystal and its relevance to collagen. In: Federation Proceedings, 39 (6). p. 1788.
Ramachandran, GN (1973) Non-Planar And Nonstandard Peptide Units In Protein And Peptide Structures. In: Federation Proceedings, 32 (3). p. 495.