TY - JOUR A1 - Uhlemann, Erhard A1 - Mickler, Wulfhard A1 - Reich, Annett A1 - Bart, Hans-Joerg T1 - Liquid membrane permeation of zinc, cadmium and nickel with 4-acyl-5-pyrazolones and ß-diketones Y1 - 1996 ER -