@article{21278,
      author       = "Ryttersgaard, Jes and VIII. Internat. Kurs für
                      Ingenieurvermessung, Zürich 24. Sept. - 1. Okt. 1980",
      title        = "On Control Measurements of Rotating Kilns  ",
      year         = "1980",
      note         = "1 sv., Obr. v textu - Souhrn v něm., angl. a franc.",
}