@misc{indiciaea6b739143fc6,
  title = {Remote sensing of urban environments.},
  author = {Alexander, R. H. and Bowden, L. W. and Marble, D. F. and Moore, E. G.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690049023},
  note = {Source identifier: 19690049023}
}