@article{448,
      author       = "Erker, Erhard and Fed. off. for metrology and Surv. Vienna
                      and 19. IUGG - Vancouver, Aug. 9-22, 1987",
      title        = "A refined solution of the Austrian geoid using modified
                      astronomical and gravimetric levelling  ",
      year         = "1987",
      note         = "Liter. - 5 obr., 1 sv.",
}