@inproceedings{DoerenKroeschel1991,
  author    = {D{\"o}ren, Horst-Peter and Kr{\"o}schel, R.},
  title     = {Plasma-Spritzen},
  series = {Schweisszusatzwerkstoffe : Fortschritte, Erfahrungen, Tendenzen. 2. Aachener Schweisstechnik-Kolloquium, 7. bis 8. M{\"a}rz 1991},
  booktitle = {Schweisszusatzwerkstoffe : Fortschritte, Erfahrungen, Tendenzen. 2. Aachener Schweisstechnik-Kolloquium, 7. bis 8. M{\"a}rz 1991},
  editor    = {Dilthey, Ulrich},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  isbn      = {3-18-140802-6},
  pages     = {147 -- 167},
  year      = {1991},
  language  = {de}
}
@inproceedings{SchwarzerBiegerRickingetal.1991,
  author    = {Schwarzer, Klemens and Bieger, W. and Ricking, N. and Bansal, Narenda K.},
  title     = {Solar cooker with a rock bed cum oil storage},
  series = {1991 Solar World Congress : : proceedings of the Biennial Congress of the International Solar Energy Society, Denver, Colorado, USA, 19 - 23 August 1991 / ed. by M. E. Arden. Bd. 3,II},
  booktitle = {1991 Solar World Congress : : proceedings of the Biennial Congress of the International Solar Energy Society, Denver, Colorado, USA, 19 - 23 August 1991 / ed. by M. E. Arden. Bd. 3,II},
  publisher = {Pergamon Pr.},
  address   = {Oxford},
  isbn      = {0-08-041690-x},
  pages     = {3751 -- 3756},
  year      = {1991},
  language  = {en}
}
@inproceedings{SchwarzerWiedenfeldBansaletal.1991,
  author    = {Schwarzer, Klemens and Wiedenfeld, M. and Bansal, Narenda K. and Ertl, Karl-Heinz},
  title     = {A novel solar sterilization and water destillation system : experiment and thermodynamic analysis},
  series = {1991 Solar World Congress : : proceedings of the Biennial Congress of the International Solar Energy Society, Denver, Colorado, USA, 19 - 23 August 1991 / ed. by M. E. Arden. Bd. 2,II},
  booktitle = {1991 Solar World Congress : : proceedings of the Biennial Congress of the International Solar Energy Society, Denver, Colorado, USA, 19 - 23 August 1991 / ed. by M. E. Arden. Bd. 2,II},
  publisher = {Pergamon Pr.},
  address   = {Oxford},
  isbn      = {0-08-041690-x},
  pages     = {2276 -- 2281},
  year      = {1991},
  language  = {en}
}