K. ERŐSS-KISS, V. IZVEKOV, and E. PUNGOR, “STRUCTURE ELUCIDATION AND ANALYTICAL APPLICATION OF THE ISOTHIOCYANATO-PYRIDINE COMPLEXES OF SOME TRANSITION METAL IONS USING IR AND FIR SPECTROSCOPY ”, Period. Polytech. Chem. Eng., vol. 24, no. 1, pp. 73–82, Jan. 1980.