1. Y. V. EGOROV, V. V. PUSHKAREV, E. V. TKACHENKO, J. Inorg. Chem. (USSR), 6 (1961) 256.
2. Y. V. EGOROV, V. V. PUSHKAREV, E. V. TKACHENKO, Radiokhimiya, 3 (1961) 87.
3. N. YAMAGETE, K. IWASHIMA, Nature, 200 (1963) 52.
4. W. H. SHIPMAN, Concentration of strontium from seawater by manganese dioxide. Determination of90Sr in large volume of seawater. U. S. Naval Radiological Defense Laboratory, Rept. USNRDL-TR-995, 1966.
5. R. FUKAI, L. JUYNH-NGOC, D. VAS, Nature, 211 (1966) 726.