@article{795,
      author       = "Molenaar, Martien and Hoop, Sylvia de",
      title        = "Advanced geographic data modelling. Spatial data modelling
                      and query languages for 2D and 3D applications  ",
      year         = "1994",
      note         = "Obr. a tab. v textu.-Liter.-Abstr., 1 sv.",
}