1. Otto S. Wolfbeis. Methylenaktive Nitroverbindungen, 3. Darstellung von 3-Amino-2-nitroacrylsäure-Derivaten und Nitro-4H-pyrido[1,2-a]pyrimidinen aus Nitroessigsäure-ethylester. Chem. Ber., 1977, 110, 7, p. 2480-2493.
2. K. K. Babievsky; V. M. Belikov. Synthesis of alpha-Nitroacetoacetic Ester. Synth. Comm., 1977, 7, 4, p. 269-271.
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http://dx.doi.org/10.1080/00397917708050746
3. Yoshiro Matsuda et al. A Novel 1,6-Cyclization of Imidazolium N-Allylides (2): Formation of the Mesomeric Betaine, 7-Iminoimidazo[1,2-a]pyridiniumide. Heterocycles, 1991, 32, 11, p. 2217-2224.
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4. Yoshiro Matsuda et al. Synthesis of Mesomeric Betaines, [1,2,4]Triazolo[2,3-a]pyridiniumides, via Back-donated 1,6-Cyclization. Heterocycles, 2000, 53, 1, p. 213-218.
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