Issazadeh, Zahra, et al. “A Facile Four-Component Synthesis of Pyrazolophthalazines Using Tetrabutylammonium Bromide As Efficient Ionic Liquid Catalyst”. International Pharmacy Acta, vol. 1, no. 1, Mar. 2018, pp. 65-65, doi:10.22037/ipa.v1i1.20070.