1. Advances in Heterocyclic Chemistry
Volume 85, 2003, Pages 67-171
Heterocyclic Mesomeric Betaines and Analogs in Natural Product Chemistry. Betainic Alkaloids and Nucleobases
Andreas Schmidt
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http://dx.doi.org/10.1016/S0065-2725(03)85002-X 2. Liebigs Annalen der Chemie
Volume 1990, Issue 9, pages 841–846
The complex reaction of acetohydrazides with unsaturated diketones: Alternative cyclizations to 1,2-diazepin-3-ones and pyrazolo[3,4-b]pyridines
Paloma Alonso, Nazario Martín-León, Margarita Quinteiro, Carlos Seoane, José L. Soto
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http://dx.doi.org/10.1002/jlac.1990199001158 
