1. Metodi analiza weshtestw osoboi tshistoti i monokristalow, vip. 1, p. 32, Kharkow. 1962.
2. L. Szebell�dy andM. Ajtai, Mikrochem.25, 258 (1938);26, 72, 75 (1939).
3. J. Bogn�r, Magy. k�m. foly.57, 367 (1951);66, 331 (1960).
4. P. B. Bontschev, Mikrochim. Acta [Wien]1962, 584.
5. A. E. Martell andM. Calvin, Chemistry of the Metal Chelate Compounds. New York: Prentice-Hall. 1952;F. Basolo andR. G. Pearson, Mechnisms of Inorganic Reactions. New York: Wiley. 1958.