@article{33657,
      author       = "Gysen, Herman van and Merry, Charles L. and IAAG -
                      Genmeeting, Edinburgh 1989",
      title        = "Towards a gross-validated spherical spline geoid for the
                      south-western Cape. South Africa  ",
      year         = "1989",
      note         = "Obr. a tab. - Liter.",
}