Nurkenov, O., I. Kulakov, Z. Satpaeva, A. Zhakina, and KaluginС. 2011. “Synthesis and Intramolecular Geterocyclezation of Thiosemycarbozide Derivatives on the Basis Salicylic Acid”. Chemical Bulletin of Kazakh National University 61 (1), 322-28. https://chemistry.kz/bulletin/index.php/kaznu/article/view/930.