@article{GoettscheSchwarzerRoetheretal.2011,
  author    = {Joachim G{\"o}ttsche and Klemens Schwarzer and S. R{\"o}ther and Sabine Jellinghaus},
  title     = {Efficient daylighting, heating and shading with rooflight heliostats},
  journal   = {Conference Internationale Energie Solaire et Batiment},
  pages     = {243 -- 248},
  year      = {2011},
}