@article{81,
      author       = "4th International Symposium Geodesy and Physics Earth GDR
                      Karl - Marx - Stadt, May 12th - 17th, 1980",
      title        = "4th International Symposium Geodesy and Physics Earth GDR
                      Karl - Marx Stadt, May 12th - 17th, 1980. Proceedings. Part
                      II  ",
      year         = "1981",
      note         = "1 sv., obr. a tb. v textu. - Liter.",
}