Vijay Nair, Smitha C. Mathew, Akkattu T. Biju, and Eringathodi Suresh «A Novel Reaction of the "Huisgen zwitterion" with Chalcones and Dienones: An Efficient Strategy for the Synthesis of Pyrazoline and Pyrazolopyridazine Derivatives». Angew. Chem Int Ed, 46, 2007, p. 2070-2073. DOI: 10.1002/anie.200604025.