@inproceedings{SpaeteHafnerSchwarzer2000,
  author    = {Sp{\"a}te, Frank and Hafner, B. and Schwarzer, Klemens},
  title     = {A system for solar process heat for decentralized applications in developing countries},
  series = {ISES 1999 Solar World Congress, Jerusalem, Israel, July 4-9, 1999 : conference proceedings / ed. Gershon Grossman. Vol. 3},
  booktitle = {ISES 1999 Solar World Congress, Jerusalem, Israel, July 4-9, 1999 : conference proceedings / ed. Gershon Grossman. Vol. 3},
  publisher = {Elsevier},
  address   = {Oxford},
  isbn      = {0-080-043895-4},
  pages     = {236 -- 291},
  year      = {2000},
  language  = {en}
}
@article{MelissSpaete2000,
  author    = {Meliß, Michael and Sp{\"a}te, Frank},
  title     = {The solar heating system with seasonal storage at the Solar-Campus J{\"u}lich},
  series = {Solar energy. Vol. 69 (2000), iss. 6},
  journal   = {Solar energy. Vol. 69 (2000), iss. 6},
  issn      = {0038-092X},
  pages     = {525 -- 533},
  year      = {2000},
  language  = {en}
}