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- [1] β-lactam antibiotics.: Spectroscopy and molecular orbital (MO) calculations -: Part I:: IR studies of complexation in penicillin-transition metal ion systems and semi-empirical PM3 calculations on simple model compounds SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 1997, 53 (14) : 2649 - 2658