Z. I. G. Beresnevichyus, V. Yu. Vilyunas, V. I. Raudelyunas and R. S. Baltrushis; Reaction of 2-aminopyridines with α, β-unsaturated acids; Chemistry of Heterocyclic Compounds; Volume 28, Number 1, 71-75
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http://dx.doi.org/10.1007/BF00529483