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Handbook of Heterocyclic Chemistry by: Katritzky, Alan R., 1928-2014 Published: (1985)
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Indoles by: Sundberg, E. J. Published: (1996)
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Heterocyclic chemistry by: Joule, J. A., et al. Published: (2010)
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Heterocyclic chemistry at a glance by: Joule, J. A., et al. Published: (2013)