@article{30938,
      author       = "Lang, Herbert and Sacher, Martina and Schoch, Henning and
                      EUREF-Symposium, Sofia, Bulgaria, June 4-7, 1997",
      title        = "Status and results of the adjustment and enlargement of the
                      United european levelling network 1995 (UELN-95)  ",
      year         = "1997",
      note         = "1 sv.",
}