Sizova, Z. A., A. A. Karasyov, L. L. Lukackaya, and A. O. Doroshenko. “Acid-Base and Spectral Properties of 3 (benzothiazolyl-2)cumarins and Their Imino Analogs”. Kharkiv University Bulletin. Chemical Series, no. 26, May 2016, pp. 26-38, doi:10.26565/2220-637X-2016-26-03.