@article{Pettersson1999,
  title={{Modeling photocurrent action spectra of photovoltaic devices based on organic thin films}},
  author={Pettersson, L.A.A. and Roman, L.S. and Ingan{\"a}s, O.},
  journal={Journal of Applied Physics},
  volume={86},
  pages={487},
  year={1999}
}

@article{Stubinger2001,
  title={{Exciton diffusion and optical interference in organic donor--acceptor photovoltaic cells}},
  author={St{\"u}binger, T. and Br{\"u}tting, W.},
  journal={Journal of Applied Physics},
  volume={90},
  pages={3632},
  year={2001}
}