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Heterocyclic Chemistry: Volume 3, Five-membered ring systems. H. Suschitzky, O. Meth-Cohn, G. V. Boyd, J. de Mendoza, J. Elguero, S. Gronowitz
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Nuclear Magnetic Resonance: Volume 33, Application of nuclear shielding. G. A. Webb, S. Kuroki, N. Asakawa, H. Yasunaga
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