@article{SchmalzlinvanDongenKlimantetal.2005,
  author    = {E. Schmalzlin and J. T. van Dongen and I. Klimant and Bettina Marmodee and Martin Steup and Joachim Fisahn and Peter Ludwig Geigenberger and Hans-Gerd L{\"o}hmannsr{\"o}ben},
  title     = {An optical multifrequency phase-modulation method using microbeads for measuring intracellular oxygen concentrations in plants},
  year      = {2005},
}