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Ramamoorthy, P and Sheela, BV (1973) Modification of the flexible polyhydron method for function minimisation. Technical Report. National Aeronautical Laboratory, Bangalore, India.
Vijayan, Kalyani and Anderson, BF and Hodgkin, DC (1973) Crystal and molecular structure of a synthetic compound related to the Penicillins and Cephalosporins, 3-BenzyS 7-t-Butyl 2,2-DimethyI-8-oxo-4-thia-1-aza-6aH-bicycfo[4.2.0]octane-3b,13; 7a-dicarboxylate. Journal of the Chemical Society. pp. 484-488.