Singh, Daroga, Bishwa Prakash Rai, and Vandana Singh. 2010. “1,3-Dipolar Cycloaddition Reaction of Benzonitrile Oxide With 4-Arylmethylene-2,4-Dihydro-2,5-Disubstituted-3H-Pyrazol-3-Ones”. Asian Journal of Chemistry 20 (8):6451-56. https://asianpubs.org/index.php/ajchem/article/view/12995.