Thuan, T. T. D.; Phien, T. D.; Tukumova, N. V.; Usacheva, T. R. STABILITY OF COBALT AND NICKEL COMPLEXES OF SUCCINIC AND MALEIC IONS STUDIED BY POTENTIOMETRIC TITRATION, UV-VIS SPECTROPHOTOMETRY AND QUANTUM CHEMICAL CALCULATIONS. IVUZKKT 2024, 67, 6-16.