@misc{indiciae7b21c6c1c2f4,
  title = {On the existence of maximum likelihood estimates for presence-only data},
  author = {Trevor J. Hefley and Mevin Hooten},
  year = {2015},
  doi = {10.1111/2041-210x.12340},
  url = {https://pubs.usgs.gov/publication/70173664},
  note = {Source identifier: 70173664}
}