TY - JOUR A1 - Wüstneck, Rainer A1 - Fiedler, H. A1 - Miller, Reinhard A1 - Haage, K. T1 - Surface chemical characterisation of maleic acid mono[(4-alkyl-piperazine-2-yl)-ethylesters] : 2. The pH dependent adsorption behavior of an ampholytic surfactant Y1 - 1994 ER -