@article{geosparqlsyntaxsemanticsandsystemfor,
  title = {GeoSPARQL+: Syntax, Semantics and System for Integrated Querying of Graph, Raster and Vector Data -- Technical Report},
  author = {Timo Homburg and Steffen Staab and Daniel Janke},
  year = {2020},
  eprint = {2009.05032},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2009.05032v1},
}