@article{641,
      author       = "Buschmann, E. and XIV. Val.shromáždění MUGG, Lucerne,
                      25.9. - 7.10. 1967",
      title        = "Accidental and systematic errors of time observations and
                      time systems  ",
      year         = "1967",
      note         = "2 x 1 seš.",
}