@article{guastaldi2013multivariate,
  title={A multivariate spatial interpolation of airborne $\gamma$-ray data using the geological constraints},
  author={Guastaldi, Enrico and Baldoncini, Marica and Bezzon, Giampietro and Broggini, Carlo and Buso, Giampaolo and Caciolli, Antonio and Carmignani, Luigi and Callegari, Ivan and Colonna, Tommaso and Dule, Kujtim and others},
  journal={Remote sensing of environment},
  volume={137},
  pages={1--11},
  year={2013},
  publisher={Elsevier}
}