@article{7753,
      author       = "Heck, B. and Univers. Stuttgart and 19. IUGG - Vancouver,
                      August 9-22, 1987",
      title        = "Effects of Non-Linear Terms in the geodetic Boundary Value
                      Problem  ",
      year         = "1987",
      note         = "Liter. - Abstr., 1 sv.",
}