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Mitra, Alok K and Chandrasekaran, R (1977) Conformational analysis of cyclo (l-cystine. In: International Journal of Peptide and Protein Research, 10 (3). 235 -239.
Ramachandran, GN and Mitra, Alok K (1976) An explanation for the rare occurrence of cis peptide units in proteins and polypeptides. In: Journal of Molecular Biology, 107 (1). pp. 85-92.