@article{WuestneckFiedlerMilleretal.1994,
  author    = {W{\"u}stneck, Rainer and Fiedler, H. and Miller, Reinhard and Haage, K.},
  title     = {Surface chemical characterisation of maleic acid mono[(4-alkyl-piperazine-2-yl)-ethylesters] : 2. The pH dependent adsorption behavior of an ampholytic surfactant},
  year      = {1994},
  language  = {en}
}
@article{FiedlerWuestneckWeilandetal.1994,
  author    = {Fiedler, H. and W{\"u}stneck, Rainer and Weiland, B. and Miller, Reinhard and Haage, K.},
  title     = {Surface chemical characterization of maleic acid mono[(4-alkyl piperazine-2-yl)- ethylesters] :1. The complex adsorption behavior of an ampholytic surfactant},
  year      = {1994},
  language  = {en}
}