@article{HaenselKwakWaclaweketal.1996,
  author    = {H{\"a}nsel, Horst and Kwak, A. and Waclawek, W. and Weigt, Harry},
  title     = {Phthalocyanine chemosensors, part III : spectral (UV-VIS and IR) properties of octaalkoxyphthalocyanines and their multimerization},
  year      = {1996},
  language  = {en}
}
@article{HaenselWaclawekWeigtetal.1994,
  author    = {H{\"a}nsel, Horst and Waclawek, W. and Weigt, Harry and Kwak, A.},
  title     = {Phthalocyanine chemisensors, part I : oscillation spectra of lanthanide diphthalocyanines},
  year      = {1994},
  language  = {en}
}