Deshmukh, A.Y., et al. “ Synthesis of 3-(4´´ -Substituted Phenyl)-5-(4&Acute;-Substituted Phenyl)- Δ2-Pyrazolines and Their Derivatives ”. Asian Journal of Chemistry, vol. 14, no. 1, Mar. 2010, pp. 185-9, https://asianpubs.org/index.php/ajchem/article/view/21992.