@inproceedings{BaumannTeixeiraBouraEcksteinetal.2013,
  author    = {Torsten Baumann and Cristiano Jos{\´e} Teixeira Boura and Julian Eckstein and Jan Dabrowski and Joachim G{\"o}ttsche and Bernhard Hoffschmidt and Stefan Schmitz and Stefan Zunft},
  title     = {Properties of bulk materials for high-temperature air-sand heat exchangers},
  booktitle = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 2},
  pages     = {1270 -- 1278},
  year      = {2013},
}