1. Berger, R.; Leuckel, W.; Wolf, D.: Chem.-Ing. Tech. 50 (1978) Nr. 7, S. 544/545, MS 602/78.
2. Widmer, F.: Chem.-Ing.-Tech. 39 (1967) Nr. 15, S. 900/906.
3. Spaay, N. M.; Simons, A. J. F.; ten Brink, G. P.: Proc. Int. Solv. Extr. Conf. 1971, Vol. 1; Soc. Chem. Ind., London 1971.
4. Misek, T.: Recommended Systems for Liquid Extraction Studies. Inst. chem. Engrs., Rugby 1978.
5. Brandt, H. W.; Reissinger, K.-H.; Schröter, J.: Chem.-Ing.-Tech. 50 (1978) Nr. 5, S. 345/354.