Pise, Ashok S., et al. “Ultrasound Assisted Synthesis of 1,5-Diaryl and 1,3,5-Triaryl-2-Pyrazolines by Using KOH EtOH System With Cu(I) Catalyst”. Asian Journal of Chemistry, vol. 30, no. 4, Feb. 2018, pp. 894-6, doi:10.14233/ajchem.2018.21131.