1. G. Schill, in ?Ion Exchange and Solvent Extraction?, Bd. 6, J. A. Marinsky and Y. Marcus, Eds., New York. 1974.
2. K. Gustavii und G. Schill, Acta Pharm. Suec.3, 241 (1966).
3. K. Gustavii und G. Schill, Acta Pharm. Suec.3, 259 (1966).
4. K. Gustavii, Acta Pharm. Suec.4, 233 (1967).
5. G. Schill, Analyt. Chim. Acta21, 341 (1959).