1. Nuclear Magnetic Resonance Spectroscopical Studies of 2-Carbonyl Derivatives of Five-membered Monoheterocycles and Determination of Aromaticity Indices
Kyu Ok Jeon, Ji Sook Yu, and Chang Kiu Lee
Heterocycles, 2003 , vol. 60, # 12 p. 2685 - 2706
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http://dx.doi.org/10.3987/COM-03-9889
Silverstein et al.
Journal of the American Chemical Society, 1954 , vol. 76, p. 4485
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http://dx.doi.org/10.1021/ja01646a070
Advanced Synthesis & Catalysis
Volume 346, Issue 12, pages 1457–1460, October 2004
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http://dx.doi.org/10.1002/adsc.200404181