@article{20211,
      author       = "Sacerdote, F. and Sanso', F. and Univ. Pisa - Dep. Mathem.
                      and 19. IUGG - Vancouver, Aug. 9-22, 1987",
      title        = "New Developments of Boundary Value Problems in Physical
                      Geodesy  ",
      year         = "1987",
      note         = "Liter., 1 sv.",
}