Buzmakova, N.A. “SYNTHESIS OF NEW BIOLOGICALLY ACTIVE PYRIMIDINECARBOXAMIDES CLASS SUBSTANCE WITH HIGH ANALGESIC ACTIVITY”. Perm Federal Research Centre Journal, no. 2, Oct. 2015, pp. 15-16, https://journal.permsc.ru/index.php/pscj/article/view/PSCJ2015n2p2.