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2. bQuin, L. D.; Tyrell, J. A. Fundamentals of Heterocyclic Chemistry; Wiley: New Jersey, 2010; pp 222–225 (Chapter 9.2).
3. cBergman, J.; Janosik, T. in Modern Heterocyclic Chemistry; Alvaroz-Builla, J.; Vaquero, J. J.; Barluenga, J., Eds. Wiley-VCH: Weinheim, 2011; Vol. 4, pp 269–375 (Chapter 4).